Which of the following is an example of time dilation?
A)As material approaches a black hole event horizon, it appears redder and redder.
B)The time that a star spends as a giant is much shorter than its main-sequence lifetime.
C)Pulsars' pulsation periods slow down as they age.
D)As a star approaches a black hole's event horizon, it appears to move more and more slowly.

Question

Quizplus · Accepted Answer

Time dilation occurs when an object in motion (or near a massive object like a black hole) appears to have its time slowed down relative to a stationary observer. As the star approaches the black hole's event horizon, its motion appears to slow down to an observer, indicating time dilation. Choices A and C describe redshift and time dilation due to relativistic effects, but they are not examples of time dilation as defined by special relativity. Choice B does not involve time dilation at all but is related to the evolution of stars.

Which of the Following Is an Example of Time Dilation