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A gas absorbs a photon of 355 nm and em...

A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm. The other is at:

A

`743 nm

B

518 nm

C

1035 nm

D

325 nm

Text Solution

Verified by Experts

The correct Answer is:
A
`(hc)/(lamda)=(hc)/(lamda_(1))+(hc)/(lamda_(2))`
or `1/(lamda)=1/(lamda_(1))+1/(lamda_(2))`
`1/355=1/680+1/(lamda_(2))`
or `1/(lamda_(2))=1/355-1/680=(680-355)/(355xx680)` `1/(lamda_(2))=1.346xx10^(-3):.lamda_(2)=743nm`
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