According to the special theory of relativity,which of the following happens to the length of an object,measured in the dimension parallel to the motion of its inertial frame of reference,as the velocity of this frame increases with respect to a stationary observer?
A)length increases
B)length decreases
C)length remains constant
D)length vanishes to zero when velocity equals half speed of light

Question

Quizplus · Accepted Answer

According to the special theory of relativity, as the speed of an object increases relative to a stationary observer, its length measured in the dimension parallel to the motion of the frame of reference decreases. This is known as length contraction. Therefore, the correct choice is B, which states that the length decreases. Option D is incorrect since length contraction does not cause an object's length to vanish to zero.

According to the Special Theory of Relativity,which of the Following