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Question: If the speed of light were 2/3 of its present value, the energy released in a given atomic explosion...

If the speed of light were 2/3 of its present value, the energy released in a given atomic explosion will..... be of the initial value –

A

2/3

B

4/9

C

5/9

D

5/9\sqrt{5/9}

Answer

4/9

Explanation

Solution

E = mc2

Ž E2E1\frac { E _ { 2 } } { E _ { 1 } } = (c2c1)2\left( \frac { c _ { 2 } } { c _ { 1 } } \right) ^ { 2 } = (2/3)2 = 49\frac { 4 } { 9 }