An astronaut traveling with a speed v = 0.90 c holds a meterstick in his hand. If he measures its length, he will obtain a value of
A) 1.0 m
B) 2.3 m
C) 0.19 m
D) 0.43 m
E) 0.81 m

Question

Quizplus · Accepted Answer

When the astronaut measures the length of the meterstick, he will obtain its proper length, which is the length measured in the rest frame of the object. Since the meterstick is at rest relative to the astronaut, he will measure it to be 1.0 m, its proper length.

An Astronaut Traveling with a Speed V = 0