A photon of 400 nm is absorbed by a gas molecule and then the molecule re-emits two photons. One re-emitted photon has wavelength 500 nm. Assuming no change in energy of molecule, the wavelength of th

Question

A photon of 400 nm is absorbed by a gas molecule and then the molecule re-emits two photons. One re-emitted photon has wavelength 500 nm. Assuming no change in energy of molecule, the wavelength of the second re-emitted photon is

Prashant Kotian · Accepted Answer

Correct answer: B. Energy conservation: 1/lambda_abs = 1/lambda1 + 1/lambda2. 1/400 = 1/500 + 1/lambda2 => 1/lambda2 = 1/2000 => lambda2 = 2000 nm.

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