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A certain dye absorbs light of lambda = ...

A certain dye absorbs light of `lambda = 4000 "Å"` and then flurescences light of `lambda = 5000"Å"` . Assuming that under given conditions 50 % of the absorbed energy is re-emitted out as fluorescence , calculate the ratio of the number of quanta emitted out to the number of quanta absorbed :

A

`(5)/(8)`

B

`(8)/(5)`

C

`(3)/(8)`

D

`(8)/(3)`

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The correct Answer is:
A
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