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Modern Physics — Test Answers

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Which describes what an outside observer at rest would observe about a spaceship that speeds up and approaches the speed of light?

A
Time moves more slowly on the spaceship, and the length of the spaceship increases.
B
Time moves more slowly on the spaceship, and the length of the spaceship decreases.
C
Time moves faster on the spaceship, and the length of the spaceship decreases.
D
Time moves faster on the spaceship, and the length of the spaceship increases.
22
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Which describes the results of the double slit experiment? Choose two correct answers.

A
Waves produced a diffraction pattern.
B
Beams of light separated as they passed through a prism.
C
Results supported the wave theory of light.
D
Results supported the particle theory of light.
E
Results demonstrated the relationship between electric and magnetic fields.
23

Which statement is supported by Einstein’s postulates of special relativity?

A
The laws of physics change, depending on the reference frame of the observer.
B
The laws of physics change, depending on the state of motion of the observer.
C
The speed of light through empty space depends on the state of motion of the observer.
D
The speed of light through empty space is constant regardless of the state of motion of the observer.
24

Which colors will eject electrons when they strike sodium, which has a frequency threshold of 5 point 7 times 10 to the 14th power Hz ?

A
red and orange
B
violet and green
C
red, violet, green, and orange
D
violet only
25

Which statement is supported by this scenario?

A
The person in the helicopter will observe the speed of the spy as 95 kilometers per hour , and the person in the car will observe the speed of the spy as 105 kilometers per hour .
B
The spotter above the tunnel will observe the speed of the spy as 95 kilometers per hour , and the person in the car will observe the speed of the spy as 200 kilometers per hour .
C
The person in the helicopter and the spotter above the tunnel will both observe the speed of the person on the train as 95 kilometers per hour .
D
The person in the car and the spotter above the tunnel will both observe the speed of the person on the train as 95 kilometers per hour .

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