Question

According to Einstein’s special theory of relativity, which of these objects should be the heaviest?

(a) A

(b) B

(c) C

(d) D

This question was posed to me during an interview.

This interesting question is from Einstein’s Special Theory of Relativity topic in portion Ultrasonics & Relativity of Engineering Physics I

Answer 1

The correct choice is (c) C

To explain: As we know, m = \(\frac{m_0}{\sqrt{1-\frac{V^2}{c^2}}}\)

Using this formula on all of the objects we get,

For object A: m = 1.127 m0

For object B: m = 2.197 m0

For object C: m = 3.034 m0

For object D: m = 0.70 m0

Hence, Object C has the highest mass.