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A 20-year-old person goes at a high speed in a rocket on his birthday. when he comes back to earth after 1 earth year, he would be ___________

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A 20-year-old person goes at a high speed in a rocket on his birthday. when he comes back to earth after 1 earth year, he would be ___________

(a) 1 year older

(b) 2 years older

(c) A few months older

(d) Same age

I have been asked this question by my school principal while I was bunking the class.

This key question is from Lorentz Transformation Equations in chapter Ultrasonics & Relativity of Engineering Physics I

1 Answer

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Right option is (c) A few months older

Explanation: When a person is going around at high speed, time dilation takes place. For that person, the time starts running slowly. Thus, as 1 earth year has passed away but for that person, it must have been only a few months.

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