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 :

Options

A. 1035 nm
B. 325 nm
C. 743 nm
D. 518 nm

Answer

C

Explanation

( c) energy values are always additive
`E_("total") = E_1 + E_2`
`(hc)/(lamda) = (hc)/(lamda_1) + (hc)/(lamda_2)`

:. `(1)/(lamda) = (1)/(lamda_1) + (1)/(lamda_2)`
`(1)/(355) = (1)/(680) + (1)/(lamda_2)`
`lamda_2 = 742.77 nm = 743 nm`.