1.

A gasabsorbs photonof 355nm andemits two wavelengthif oneof theemissionis at 680nm the otheris at .

Answer»

1035 NM
325 nm
743 nm
518 nm

Solution :`E= hv = (hc)/(lambda)`
`(hc)/(lambda) = (hc )/(lambda)+ (hc)/( lambda_(2))`
`(1)/(355)=(1)/(680)+ (1)/(lambda)`
`=(680)/(355) xx (355)/( 680)`
`lambda_(2)= (355 xx 680)/( 325)= 742.769 = 743nm`


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