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A substance absorbs electromagnetic radiations of wavelength 12.3 nm and then emits another electromagnetic radiation of wavelength 24.6 nm. If ratio of number of photons absorbed to number of photons emitted is 2 : 1 then ratio of energy absorbed to energy emitted will be:

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a
2 : 1
b
1 : 1
c
4 : 1
d
1 : 4

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detailed solution

Correct option is C

Then ratio of energy absorbed to energy emitted will be:

EabBorbed =nab×124012.3Eabeorbed =nem×124024.6 =21×24.612.3 =49.212.3 =4:1

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