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If the speed of light were 2/3 of its pr...

If the speed of light were 2/3 of its present value, what would be fractional decrease in the energy released in a given atomic explosion

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Energy `prop c^2`
Fractional decrease in energy =`(E_1-E_2)/E_1=1-(C_2/C_1)^2`
`=1-(2/3)^2=5/9`
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