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Unit 6 Modern Physics Assignment - Quiz- Bhavya Shah Flashcards | StudBud
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Unit 6 Modern Physics Assignment - Quiz- Bhavya Shah
Unit 6 Modern Physics Assignment - Quiz- Bhavya Shah
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1
What is the mass of a ball flying at 30m/s if it has a de Broglie wavelength of 3.0 x 10^-34m? (Use 6.63x 10^-34 for h).
1kg
0.074kg
70g
0.07kg
2
Which of the following is the proper name for electrons released during the photoelectric effect.
Electrons
None of the above.
Photons
Photoelectrons
3
Which of the following equations describe the Compton effect?
pphoton = pphoton' + pelectron'
E = m c2
p = h / λ
Ephoton = W + Ek
4
Who hypothesized that if photons have wavelengths, perhaps all particles with momentum have wavelengths?
W.H. Bragg & W.I. Bragg
Louis de Broglie
L.H. Germer
C.J. Davisson
5
Look at the image below. It includes a diagram for you to compare the wavelength of your light to the colour.
Green
Blue
Pink
Yellow
6
What did the Michelson-Morley Experiment achieve? Below is an image of their setup.
Ether does not exist
All of the above
Light travels at a speed of 3.0 x 10^8 m/s despite of motion of observer
Light did not act like other waves such as sound
7
According to Einstein's simultaneity train example, is Person A or Person B correct about the timing of the explosions?
Person B is correct
Both are correct
Person A is correct
Both are incorrect
8
One eV is equal to 1.6 x 10^-19J.
True
False
9
Did the junior patent clerk in Switzerland invent the concepts of frames of reference?
False
True
10
According to wave-particle duality, does light exhibit wave or particle characteristics?
It exhibits both wave and particle characteristics
It exhibits both, just not at the same time.
It exhibits wave characteristics only
It exhibits particle characteristics only
11
An electron is moving at 2.0 x 10^6 m/s. What type of wave/ray is the photon according to its wavelength?
Microwave/Infrared
Ultraviolet ray
X-Ray
Visible light
12
What is the first postulate of Einstein's Special Theory of Relativity?
All the laws of physics are valid in all inertial frames of reference
Simultaneity refers to the occurence of 2 or more events at the same time
Light travels at a speed of 3 x 10^8m/s in all frames of reference
None of the above
13
The threshold frequency depends on the intensity of the light.
False
True
14
Which of the following is a definition for time dilation?
All of the above
The speeding up of time in a system as observed by an observer in motion
The indifference in time between two observers at different speeds
The slowing down of time in a system as observed by an observer in motion
15
Look at image below for the question.
Joe is 4 years older than Matt
Matt is 6 years and 7 months older than Joe
Joe is 6 years older than Matt
Matt is 4 years older than Joe
16
Which of the following is an example of a blackbody?
Molten Rocks
Iron Bars
Stars
All of the above
17
The rest mass energy of a substance is 1.8 x 10^17 J. What is its mass?
1kg
None of the above
6.0x10^8 kg
2kg
18
A photon has a momentum of 9.3 x 10^-27 kg.m/s . What is it's energy? (Use 6.63 for h)
28eV
20eV
2.0x 10^-18J
2.79x 10^-18J
19
Find the frequency of a quantum of blue light with a energy of 4.2432 x 10^-19 in Hz. (Use 6.63 x 10^-34 J.s for h)
6.4x10^15 J
6.5 x 10^14 J
6.4x10^-14 J
6.4 x 10^14J
20
A train passes a stationary observer. He measure the train to be 50m long. The proper length is 75m. What was its speed?
4.3 x 10^-5c
2.23 x 10^7 m/s
12,910m/s
0.75c
