Verified Solution • 2025–26 Session moderate

QJEEM11Ch5def: JEE Main 2011 Chemistry - Class 11 JEEM11Ch5def Solution: A gas absorbs a photon of 355 nm and emits at two wavelengths.…

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 :

Multiple Choice Options

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

Step-by-Step Verified Solution

Here a photon is divided into two photons of different wavelength.

According to the law of conservation of energy,

Energy of photon before dividing into two parts = Energy of first photon + Energy of second photon

\frac{h c}{λ} = \frac{h c}{λ_{1}} + \frac{h c}{λ_{2}}

\Rightarrow \frac{1}{λ} = \frac{1}{λ_{1}} + \frac{1}{λ_{2}}

\Rightarrow \frac{1}{355} = \frac{1}{680} + \frac{1}{λ_{2}}

λ_{2} = 742.77

nm = 743 nm

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