Question

A gas absorbs a photon of ` 355 nm` and emits at two wavelengths . If one of the emission is at ` 6 80` nm , the other is at :
A. `1035 nm`
B. `325 nm`
C. `743 nm`
D. `518 nm`

Answer 1

Correct Answer - 3
`E=E_(1)+E_(2)`
`(hc)/lambda=(hc)/lambda_(1)+(hc)/lambda_(2)rArr " "1/lambda=1/lambda_(1)+1/lambda_(2)rArr " " 1/355=1/680+1/lambda_(2)`
`lambda_(2)=742.76 nm`