Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: The ratio of time taken for light emission from an atom to that for release of nuclear energy in fission is 1 : 100. Reason: Time taken of the light emission from an atom is of the order of 10 8 s.A) If both assertion and reason are true and reason is the correct explanation of assertion
B) If both assertion and reason are true but reason is not the correct explanation of assertion
C) If assertion is true but reason is false
D) If both assertion and reason are false
Correct Answer: B
Solution :
We know that time taken for the light emission from an atom is of the order of \[{{10}^{-8}}s\]while time for emission of nuclear energy during fission is of the order of \[{{10}^{-6}}\text{s}\text{.}\]Thus, the ratio is \[=\frac{{{10}^{-8}}}{{{10}^{-6}}}=\frac{1}{{{10}^{8}}\times {{10}^{-6}}}=\frac{1}{{{10}^{2}}}\] \[=\frac{1}{100}\] \[=1:100\]
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