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Question

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


A

1035nm

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B

325nm

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C

743nm

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D

518nm

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Solution

The correct option is C

743nm


Step 1: Given data

The wavelength of the photon=355nm

The wavelength of one emission=680nm

Step 2: Calculating the other wavelength

According to the formula, Absorbed energy=emitted energy

hcλ=hcλ1+hcλ2

1λ=1λ1+1λ2

1355=1680+1λ2

1λ2=1355-1680

1λ2=680-355355×680

λ2=743nm

Final answer: The other wavelength that photon emits=743nm


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