Which of the following statements about photons is false?
a photon of visible light cannot pass through the atmosphere of the earth, and thus cannot be seen at the earth's surface.
Photon definitionPhotons are elementary particles that make up light. Before Einstein posited that light was made up of something called quanta, light was thought of as an electromagnetic wave in general. Through experiments using the Mach-Zehnder Interferometer, it was found that light consists of a collection of quanta which are now referred to as photons. Photons are as waves as well as matter. Proving that photons are matter was obtained from Einstein's ideas about the photoelectric effect.
Ef = h. v
Where Ef is the photon energy, h is Planck's constant and v is the photon frequency.
Photoelectric EffectThe photoelectric effect is a process of interaction between gamma radiation and matter where photons hit electrons in a material and these electrons are scattered into photoelectrons. This phenomenon is the beginning of the definition that photons are waves and particles. The mechanism is that when a photon with a relatively low energy (< 400 keV) hits a material, the photon beam will send all of its energy to the electrons with the highest binding energy to the atoms of a material. In general, this interaction occurs in K shell electrons because of the high binding energy compared to other shells. However, because photons are probabilistic, there may be interactions with electrons in the L, M shells and so on.
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a student has a small metal sphere that hangs from an insulating string. the student, in seeking to determine the charge on the sphere, brings a positively charged rod near the sphere and finds that the sphere is attracted to the rod. the student then brings a negatively charged rod near the sphere, and finds that the sphere is again attracted to the rod. which of the following conclusions, if any, can be drawn from these results?
The sphere is again attracted to the rod. The sphere must be empty from an insulating string.
What is the efficiency of an insulator string?As a result, the string efficiency of a suspension type insulator is defined as "the ratio of voltage across the whole string to the product of voltage across the disc nearest to the conductor and the number of discs in the string." Transmission lines on steel towers are supported by suspension insulators, which isolate the lines from the tower. They are critical to the reliable delivery of power. Suspension insulators are employed in two or more configurations depending on the transmission voltage and usage area. The string is free to swing in any direction, giving the transmission line a lot of flexibility.
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Based on what you learned about solar activity, select all of the correct statements from the following list.
The Sun does not rotate.
Solar activity can produce auroras and communication blackouts on Earth.
The solar constant never changes.
Sunspots are cooler areas of the photosphere.
Numbers of sunspots vary in approximately an 11-year cycle.
Solar activity can produce auroras and communication blackouts on Earth the correct statements from the following list.
What exactly is solar activity?A fraction of a second to billions of years are covered by the variations in the sun's magnetic field. Solar activity includes coronal mass ejections, high-speed solar winds, solar energetic particles, and solar flares.
Solar flares, coronal mass ejections, high-speed solar wind, and solar energetic particles are the four primary categories that may be used to categorise solar activity that is related to space weather. Only when a solar flare occurs on the sun's surface facing Earth do they have an effect on our planet.
The occurrence of events like solar flares and coronal mass ejections increases when the sun is active.
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compare the surface characteristics of venus with those of earth.
The surface conditions on Venus are more extreme than on Earth, with temperatures ranging from 453 to 473 °C and pressures of 95 bar.
Venus's surface is more hostile than Earth's, with temperatures between 453 and 473 °C and pressures of 95 bar. Venus is devoid of water, which strengthens the crustal rock and preserves surface characteristics. The observed characteristics demonstrate the geological processes at play.
Venus lacks surface water and has a poisonous, thick atmosphere that is nearly completely formed of carbon dioxide and sulphuric acid clouds. The atmospheric pressure at the surface of Venus is almost 90 times greater than that of the Earth at sea level. At a scorching 750 K (477 °C), Venus' surface is the solar system's warmest.
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For general projectile motion with no air resistance, the horizontal component of a projectile's velocity
A. remains a non-zero constant
B. continuously decreases
C. continuously increases
D. first decreases and then increases
E. remains zero
The horizontal component of a projectile's velocity remains non-zero constant for general projectile motion without air resistance. Projectile motion is the motion of an item as defined in physics.
Within the gravitational field. Projectile motion is exemplified by the upward vertical toss of a body. The air resistance that a body experiences during projectile travel is disregarded, leaving only the gravitational force to act on the body. A moving object's velocity is a function of time and measures how quickly its position changes in relation to a frame of reference. When an object is moving, its speed and direction are specified by its velocity. When an object moves, its location in relation to its environment changes.
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a scale from which a rock is suspended reads 5 n when the rock is out of water and 3 n when the rock is submerged. buoyant force on the rock is
A rock suspended by a weighing scale weighs 3 N when submerged in water and 5 N out of water. F= N1-N2. Substitute 5N for F1 and 3n for F2 above the expression to get F. F=5N-3N = 2N.
What is the rock's buoyant force?The weight of the water volume that the submerged object displaces is what creates the buoyant force. The buoyant force is the weight of water that has the same volume as the rock because the boulder is totally submerged. The buoyant force is still present even though the rock is sinking; it is merely smaller than the rock's weight.
What is seen on the weighing scale's reading when the lift accelerates its descent?Your perceived weight is equal to the normal force. Therefore, when the elevator accelerates upward or downward, you truly feel a little heavier than usual and a little lighter than usual.
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A photon with energy 2.30 eV is absorbed by a hydrogen atom. A is 3
b) Find the speed of the electron released from the state in part (a) when it is far from the nucleus.
km/s
The speed of the photon has been obtained as 8.9 * 10^5 m/s.
What is the speed of the electron?We know that the energy of the photon would be converted to the kinetic energy of the photon s it is moving. We would now go ahead to obtain the energy in joule.
We now have;
Energy in joules = 2.30 * 1.6 * 10^-19
= 3.68 * 10^-19 J
Then we know that;
KE = 1/2mv^2
KE = kinetic energy
m = mass of the electron
v = speed of the electron
Then
v^2= 2KE/m
v = √2KE/m
v = √2 * 3.68 * 10^-19/9.11 * 10^-31
v = 8.9 * 10^5 m/s
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Planets a and b are both the same size, but planet b has three times the mass of planet a. How does the weight of an object compare on the two planets?.
A comparison of an object's weight between the two worlds An object's weight is the same on both planets.
Why do objects of the same mass weigh differently on various planets?The weight of an object is determined by its mass and how strongly gravity pushes on it. How far apart two objects are from one another determines how strong gravity is. Because of this, the same thing weights differently on several planets.
What connection between the planets' weight and sizes do you notice?The gravity of planets, moons, and stars is the same. Depending on their size, they have different amounts of gravity. Therefore, gravity is different for larger and smaller planets. A human with more mass has greater gravitational pull, just like the planets.
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A force of 30 newtons and a force of 20 newtons act
concurrently on an object. Which of the following
resultant forces could be produced using these two
forces?
Answer:
Explanation:
Given:
F₁ = 30 N
F₂ = 20 N
_________
R - ?
If the forces act along one straight line, then 4 combinations are possible:
distinguish between absorption and emission of energy
Electrons radiate when their regain their prior energies. Electrons gain energy & ascend into elevated amounts as they absorb energy.
What is the process of absorption?The process of absorption is how the blood takes in the byproducts of digestion so that it can supply the rest of the body. The mucus allows again for passage of a digested materials into to the lymphatic system or blood during absorption. The following mechanisms allow for absorption. basic diffusion
What are the 4 types of absorption?Characteristics of absorption and digestion in general. Gastrointestinal products are absorbed through four different mechanisms: exocytosis, passive diffusion, simple diffusion, or endocytic.
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A principal theory in social psychology is social exchange theory. According to this theory, we will be most likely to help othersA. who have already helped us.B. who are closely related to us.C. when the benefits outweigh the costs.D. for whom we feel empathy.
Answer:
Explanation:
C. When the benefits outweigh the costs.
A force of 32N is applied to object of mass MKY which is at rest on a smooth horizontal surface if the product if 8M/S^2. find the value of M
Answer:
m=4kg
Explanation:
F=32, m=?, a=8ms^-2
F=ma
32=8m
32/8=m
m=4kg
two conducting cylindrical wires with a diameter of 3 cm and length of 40 cm are made from a metal with a density of 2710 kg/m3 . the wires carry equal but opposite current (the direction given in the diagram) of 7.5 amps and are suspended from a thread of length 25 cm and are 12 cm apart from each other. an external uniform magnetic field of magnitude 3.0 tesla is applied to the system.
Diameter = 3 cm
Length = 40 cm
Density = 2170 kg/m³
B = 3T
r = 12 cm
Net magnetic field on the wire 1 is
B₁ = B + (μ₀I / 2πr)
B₁ = 3.0000125 T
Net magnetic field on the wire 2 is\
B₂ = B + (μ₀I / 2πr)
B₂ = 3.0000125 T
By newton's second law,
ilB = T sin θ
(πd²l/4)lg = T cos θ
So, tension force on the thread is
T = (ilB₁)₂ + [ (πd²l/4) lg ]²
T = 11.7261398 N
So, sin θ = (ilB₁/T)
θ = 50.13°
Now, the angle created by two threads is
θ = 2θ = 2 x 50.13 = 100.26°
Therefore, the magnetic field wire conducts electricity at a particular angle.
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Compare and contrast its wavelength frequency and energy with those of other regions of the ems.
The electromagnetic spectrum demonstrates the relationships between energy, wavelength, and frequency.
The electromagnetic radiation bands can be used to define the electromagnetic spectrum. The gamma rays, which have the shortest wavelengths but the highest frequencies, at the bottom and radio waves, which have the longest wavelengths and the lowest frequency, at the top. The visible spectrum is depicted in magnified form. It is an extremely narrow band of wavelengths, frequencies, and energy that makes up the entire electromagnetic spectrum.
For instance, observe that the threshold between microwaves and radio waves is around 10 in the wavelength column. Consider the wavelength column, where the separation between microwaves and radio waves is approximately 10 cm. The energy carried by these waves ranges from 1.24 eV (microelectron volts) to 1.24 MeV, with 3GHz (gigahertz) being the corresponding value in the frequency column.
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As a system becomes more disordered, entropy a. increases. b. remains the same. c. decreases. When a volume of air is compressed, its temperature a. increases. b. decreases. c. neither increases nor decreases.
As a system becomes more disordered, entropy increases (Option a). Moreover, when a volume of air is compressed, its temperature also increases (Option a).
What is the entropy level of a system?The entropy level of a system can be defined as the level of disorder that depends on the internal energy of the such system (either closed or open system).
Therefore, with this data, we can see that the entropy level of a system depends on the disorder levels and it is higher when more disorder is present in the system.
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based on what you know about the solid earth, select all of the correct statements from the following list.
The solid earth of the correct statements from the following list:
Plate tectonics is driven by heat from Earth's interior.Much of Earth's geologic past is erased by erosion.Earth's magnetic field is produced by its metal core.Comparative planetary science or comparative planetology is the branch of space and planetary science that studies various natural processes and systems of influences and phenomena on and between multiple celestial bodies.
The four inner planets have short orbits slow rotation no rings and are made of stone and metal. The outer four planets have longer orbits and rotations, gas and liquid compositions, and numerous moons and rings. The outer planets are called gas giants because they are made of hydrogen and helium.
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When a 3.60 kg object is hung vertically on a certain light spring that obeys Hooke's law, the spring stretches 3.00 cm. (a) If the 3.60 kg object is removed, how far will the spring stretch if a 1.50-kg block is hung on it? cm (b) How much work must an external agent do to stretch the same spring 4.00 cm from its unstretched position?
The spring will extend 1.25 cm if the 3.60 kg object is removed and a 1.5 kilogram block is hung on it. To stretch the same spring 4.00 cm from its unstretched state, an work for external needs exert 0.9408J of force.
A physical body's mass is its total amount of matter of Inertia, or the body's resistance to acceleration (change of velocity) when a net force is applied, is also measured by this property. The gravitational pull an object has on other bodies is also influenced by its mass.
weight(f) = mg = 35.28N
mass(m) = 3.60 kg
spring constant(k) = F/x = 1176 Nm^-1
Currently, w = 1/2*k*x^2
w = 0.9408J and
mass = 1.50kg
Force = mg = 14.7N x = F/h = 0.0125m x = 0.0125m = 1.25cm.
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Salt water is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the volume of salt water displaced by the ship A.is less than the volume of fresh water. B.is greater than the volume of fresh water. C.is the same as the volume of fresh water. D.cannot be compared without knowing the mass & volume of the ship.
Answer:
Buoyant force B = V * ρ volume * density
Since the buoyant force is the same in both cases (salt & fresh)
a smaller volume is required when the density of the displaced water is greater
(A) is correct
Jimmy ran 5 meters west from home and then turned north to jog 12 meters. Jimmy ran 17 meters, but could have arrived at the same point by jogging in a straight line. How many meters could he have jogged using a straight line distance?.
Zero meters could he have jogged using a straight line distance.
Straight-line distance is distance between two point. Here, Jimmy arrived same point, this means that Straight-line distance is zero there is no distance between two points.
A straight line has infinite length. We can never calculate the distance between the two extreme points of the line. A straight line has zero areas, zero volume. but it has infinite length.
Straight-line distance is the distance that you measure with a ruler on a paper map. Straight-line distance does not account for the surface between the two points. It is the distance a bird or airplane would travel between the two points when flying above the surface.
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If the acceleration due to gravity on the Earth is 10m / (s ^ 2) and an gift has a mass of 50 kg, what is the force applied on the object by gravity?
Answer: BLACKPINK IN YOUR AREA SO GOOD AT MATH
Explanation:
PERIOD AHH MATH IS AAMAZING
A bow wave is produced when a speed boat moves as fast as the waves it produces. faster than the waves it produces. O nearly as fast as the waves it produces. none of the above
A bow wave is produced when a speed boat moves nearly as fast as the waves it produces.
A bow wave is produced when a speed boat moves. The faster the boat moves, the bigger the bow wave. The bow wave is created by the boat pushing water out of the way.As the water is pushed out of the way, it creates a wave that travels in front of the boat.The wave eventually reaches the shore and can create a dangerous situation for swimmers and people in the water.This displaced water then has to go somewhere, so it creates a wave. The faster the boat moves, the more water it displaces and the larger the wave becomes. Bow waves can be a nuisance for other boats trying to move through the water.They can also be dangerous if they’re large enough.To know more about waves visit:
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An object has total energy Ewhen traveling at a speed of 0.70c) The same object has total energy (when traveling at 0.90c) What is the ratio Ea E? O.00 E=mc2=nMo C2 b) 0.8 c) 1.6 d) 2.7 e) 1.3 Ji-
E1:E2 ratio is 0.60 for an item with total energy E moving at a speed of 0.70c. Total energy of the same thing (when travelling at 0.90c).In order to meet the energy needs of a growing global population.
Total energy strives to deliver energy that is affordable, dependable, and cleaner. The speed of an object, also known as v in kinematics, is a scalar quantity that refers to the size of the change in that object's position over time or the size of the change in that object's position per unit of time is called as speed.
E = mc^2 = Moc^2/(1-(v^2/c^2))^1/2
for, 0.7c = 1/(1-(0.7^2))^1/2 = 1.4
for, 0.9c = 1/(1-(0.9^2))^1/2 = 2.294
E2/ E1 = 1.4/2.294 = 0.60
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A force of 5. 0 n moves a 6. 0 kg object along a rough floor at a constant speed of 2. 5 m/s.
Answer:
BLACKPINK IN YOUR AREA I AM SO GOOD AT MATH
Explanation:
SO GOOD AT MATH BLACKPINK IN YOUR AREA
A system comprising blocks, a light frictionless pulley, a frictionless incline, and connecting ropes is shown in the figure. The 9.0-kg block accelerates downward when the system is released from rest. The tension in the rope connecting the 6.0-kg block and the 4.0-kg block is closest to..?
The tension in the rope connecting the 6.0-kg block and the 4.0-kg block is closest to 42N.
What will the tension be?From the information, we have obtained three equations for the three unknowns a, T1 and T2:
6a = T1 - 3g
4a = T2 - T1 - 2g
9a = 9g - T2
The third equations gives
T2 = 9g - 9a
Substituting that in the second equation gives:
4 a = 9 g - 9 a - T1 - 2 g
13 a = 7 g - T1
In this case, we have reduced the problem to two equations in two unknowns:
6a = T1 - 3g
13 a = 7 g - T1
Solving further will be:
78 a = 13 T1 - 39 g
78 a = 42 g - 6 T1
Subtracting the second from the first eliminates a:
0 = 19 T1 - 81 g
T1 = 81/19 * g
= 81/19 × 9.8
T1 = 42 N
The tension is 42N.
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Which of the following is a vector quantity?
Check all that apply.
speed
time
force
displacement
ternperature
momentum
velocity
acceleration
Answer:
velocity
Explanation:
7th one is the answer
why do we say that force is a vector quantity
Force is a vector quantity because its acceleration times a scalar constant (mass) equals the force (a vector quantity).
Why is force considered a vector quantity?The product of an object's mass and acceleration is used to calculate the force acting on it. A vector quantity is acceleration. Since force is a scalar constant (mass) multiplied by acceleration, which is a vector quantity, force is also a vector quantity (a vector quantity).
Because it genuinely depends on the direction in which a force is applied, force can be thought of as a vector quantity. Physically, the force can be felt as a push or a pull. This is illustrated by many physical examples.
For instance, it makes sense that we must push an object upward in order to make it move upward. It simply remains fixed if we push it downward. Knowing which direction it is pushed is crucial.
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Use the formula from the video to help you answer this question. Assume you are driving 20 mph on a straight road. Also, assume that at a speed of 20 miles per hour, it takes 100 feet to stop. If you were to increase your speed to 60 miles per hour, your stopping distance is now _____. Group of answer choices.
Answer: 900 feet
Explanation:Given Velocity (V₁)=20mph≈29.334 t/s
it take 100 feet to stop
Using Equation of motion
v²-u²=2as
where
v,u=Final and initial velocity
a=acceleration
s=distance moved
0-(29.334)²=2(-a) (100)
a=29.331²/2×100=1.302 t/s²
When velocity is 60 mph
v²-u²=2as
0-(88.002)²=2-(-4.302) (s)
s=900.08 feet
How do you calculate a distance's speed?Given a distance and the amount of time needed to travel that distance, an object's speed can be calculated using the speed formula. By substituting the known values in the formula for speed and further analyzing, we can also use the speed formula to compute the distance or time.
What are some intriguing issues that the speed formula can be used to solve?Let's use the speed formula to answer a few intriguing issues. Figure 1: In an hour, a train might go 120 kilometres. Using the speed formula, calculate the train's speed in m/s.
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Suppose you are holding a box in front of you and away from your body by squeezing the sides, as shown in (Figure 1) .
Part A
Choose the correct free-body diagram showing all of the forces on the boxWhat is the force that is holding the box up, the force that is opposite the weight force?
normal force
kinetic friction force
gravitational force
static friction force
The force that is holding the box up, the force that is opposite the weight force is normal force.
option A is the correct answer
What is normal force?
The normal force is an everyday force that is felt when a surface pushes against an object that is placed on that surface.
According to Newton's third law of motion, for every action there is equal and opposite reaction. That is the force experienced by an object is equal in magnitude to the reaction exerted by the object.
Fa = Fb
where;
Fa is the force experienced by the objectFb is the reaction exerted by the objectThe weight of every object acts downwards while the normal force or normal reaction of the object due to surface on which the object is resting acts upwards.
Thus, the force that is holding the box up, the force that is opposite the weight force is the normal force, since action force and reaction force are equal and opposite.
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if a rocket initially at rest accelerates at a rate of 50 m/s2 for one minute, its speed will be
Answer:
[tex]\huge\boxed{\sf v_f=3000 \ m/s}[/tex]
Explanation:
Given Data:Acceleration = a = 10 m/s²
Time = 1 minute × 60 = 60 seconds
Initial Velocity = Vi = 0 m/s
Required:Final Velocity = Vf = ?
Formula:[tex]\displaystyle a=\frac{v_f-v_i}{t}[/tex]
Solution:[tex]50 =\frac{v_f-0}{60} \\\\Multiply \ 60 \ to \ both \ sides\\\\50 \times 60 = v_f\\\\3000 \ m/s = v_f\\\\\boxed{v_f=3000 \ m/s}\\\\\rule[225]{225}{2}[/tex]
c) use the ruler tool (the units are in mm) on the bottom right to measure the extension of the spring with the 100g mass. convert this mass in grams to kg and then convert to w weight
A gram is now defined as 0.001 kilograms (kg).
Hooke's Law states that F = -kx.
Spring constant is the name given to the proportional constant k. It represents a stiffness measurement for the spring.
Calculation:
Given that, mass = 100 g = 0.1 kg
We shall multiply mass by the gravitational acceleration to determine the weight:
= 0.1 * 9.8 = 0.98
Force has a value of 0.98 N, which is also the value.
There is a 170 mm extension.
In light of this, the 100 g spring's extension is 170 mm.
What is the mass of a gram?In terms of Planck's constant, a gram is now defined as 0.001 kilograms (kg). Under standard gravity, a gram of mass has the same weight as a gram of force.
What exactly is the mass formula?It is defined as the mass of one mole of the chemical substance or as a ratio of the mass of a chemical compound to its constituent chemical component. Molar mass is measured in kg/mol. The mass formula is given as. Mass = ρ × v.
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a block of mass 4.73 kg lies on a frictionless horizontal surface. the block is connected by a cord passing over a pulley to another block of mass 6.13 kg which hangs in the air, as shown. assume the cord to be light (massless and weightless) and unstretchable and the pulley to have no friction and no rotational inertia calculate the tension in the cord. answer in units of n.
The tension in the cord is 33.754N.
The definition of tension.Tension is the force that a rope, string, or wire experiences when it is pulled by forces coming from opposing sides. The bodies at each end of the wire are subjected to an equal amount of tension force that is applied along the entire length of the wire. When one physical object touches another, some sort of force is applied.
Calculating the force applied is as follows:
w = mg
w = 6.13 × 9.18
w = 60.074N.
Fnet = ma
a = Fnet/m
a = 60.074/6.13+4.73
a = 60.074/10.86
a = 5.531 m/s².
Thus, tension can be determined as follows:
T = mg - ma
T = 6.13(9.18) - 4.73(5.531)
T = 60.074 - 26.32
T = 33.754N.
The tension in the cord is 33.754N.
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