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SPH4U Modern Physics Quiz Flashcards | StudBud
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SPH4U Modern Physics Quiz
SPH4U Modern Physics Quiz
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1
How much rest mass energy could you produce with 1kg of water if you convert the mass completely into energy?
3 x 108 J
9 x 1016 J
9 x 108 J
3 x 1016 J
2
Which of the following statements concerning time dilation is false?
both of red and blue
none of these options
Time is dilated relative to the proper time.
For two observers, one moving and one at rest, in an inertial reference fra
3
What is an inertial reference frame?
a frame in which Newton’s laws of motion are valid
a frame that is rotating with a constant rotational speed
a frame of motion that contains a large amount of material
4
Calculate the de Broglie wavelength of an electron travelling 4.5 x 10^6 m/s
0.98nm
1.61nm
9.11nm
4.10nm
5
Max Planck proposed that in a heated material, molecules could only vibrate with specific energy
True
False
6
Which one of the following situations does not involve an inertial reference frame?
A helicopter hovers over a lake during a rescue attempt
A merry-go-round is rotating at 5 revolutions per minute
A railroad car is heading west out of Toronto at 50 m/s
A ship is traveling toward Mars at 1200 m/s
7
What would happen if an object approached the speed of light, according to time dilation.
nothing
slowing down of time passage in a system as observed by a moving observer
speeding up of time passage in a system as observed by a moving observer
8
Protons can show the property(ies) of：
refraction
transmitting quantization
none of these above
both option red and yellow
9
Which of the following statements are true according to Albert Einstein's Special Theory of Relativity
The laws of physics are the same in all inertial reference frames
Light travels in a constant speed, relative to only non-inertial frames
All the laws of physics are valid in all non-inertial frames of reference.
10
In the photoelectric effect, what needs to exceed a minimum for electrons to eject from a metal?
The structure of this metal
Frequency of light
Intensity of light
Wavelength of light
11
The rocket travelling 0.82c takes 22s to pass the moon for the rider. How long does it take for the moon observer?
12.59s
44.00s
68.44s
38.44s
12
Since photons have properties of particles, they will bounce back to each other when they collide.
True
False
13
What is the meaning of Einstein’s famous equation E = mc
2
?
This represents the total energy of an object of mass m.
This represents the relativistic kinetic energy of an object of mass m.
This represents the energy equivalent of the mass of an object at rest.
This represents the maximum energy an object can have.
14
On what does simultaneity depend?
the scale of the event
the type of clocks used
the type of events
the motion of the observer
15
A photon's wavalength is 0.29 nm. What is its momentum ?
photons do not have momentum as they do not have mass.
3 x 108 kg x m/s
2.28 x 10-24 kg x m/s
2.28 x 10-42 kg x m/s
16
The speed of light in a vacuum is defined to be:
3.00 × 109 m/s relative to all frames of reference.
3.00 × 108 m/s relative to all frames of reference.
2990000m/s relative to all frames of reference.
3.00 × 107 m/s relative to all frames of reference.
17
The W of a metal is 6.66 x 10
-19
J, the light has λ of 500nm shining on it. What is the Ek of the ejected electron?
3.33 x 10-13 J
3.3 x 10-40 J
1.36 x 10-19 J
4.95 x 10-22 J
18
A rocket travelling 0.85c is 42m long to an observer on the Moon. How long does the rocket seem to the person riding it?
49.41m
21.00m
24.04m
35.70m
19
What didn't Michelson discover after using the Michelson-Morley interferometer
Light travelled at 3.00 × 108 m/s regardless of motion of the observer
There was something called "ether"
The speed of light is constant no matter the direction of source and mirror
20
True or False? The speed of light postulate states that nothing can travel faster than the speed of light
False
True
