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(A) : The ratio for time taken for light emission from an atom to that for release of nuclear energy in fission is 1 : 100
(R) : Time taken for the light emission from an atom is of the order of 10^-8 s.

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(A) is true but (R) is false

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

Both (A) and (R) are true and (R) is not the correct explanation of (A)

answer is A.

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Detailed Solution

Time taken for the light emission from an atom = 10^-8 s

Time taken for release of energy in fission = 10^-6 s

Required ratio = 10^-8/10^-6 = 1/100 = 1:100

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