A set of twins,Bobby and Betty,are born on the Earth.Bobby sets off to a distant planet at high speed,arrives,and heads back to Earth.Betty remains on Earth.In Bobby's frame he is at rest and Betty is moving so,according to Einstein,he has aged 20 years while Betty has aged only 2.In Betty's frame she is at rest,so she has aged 20 years and Bobby has only aged 2.Who will be older when Bobby and Betty meet again?

Question

Quizplus · Accepted Answer

According to the theory of relativity, time dilation occurs when an object is moving at high speeds. In this scenario, Bobby has traveled at high speed which means time would have moved slower for him. As a result, Betty would be older than Bobby when they meet again. Therefore, Option B, which is Betty, is the correct answer.

A Set of Twins,Bobby and Betty,are Born on the Earth