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SAT® Subject Test in Physics

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Length and Special Relativity

SATPHY-KFLKXW

A person is watching a rocket with an astronaut inside move by at a speed near the speed of light. Which of the following statements is true?

A

The length of the rocket is greater from the person's perspective than from the astronaut's perspective.

B

The length of the rocket is the same from the perspective of the person and the astronaut.

C

The length of the rocket is greater from the perspective of the astronaut than from the perspective of the person.

D

The person's length is greater, from his own perspective, as the rocket flies by, than it was before the rocket flew by.

E

The astronaut's length is greater, from his own perspective, as he flies by the person, than it was before he flew by the person.