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A photon of 300nm is observed by a gas and then re-emits two photons. One re-emitted photon has wavelength 496nm, the wavelength of second re-emitted photon is


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$E_{\text{photon absorbed}}=E_1+E_2$(energy released)
$\therefore\lambda_2 = \Large\frac{496\times300}{496-300}$$\;nm=759.183\;nm$
Hence (a) is the correct answer.
answered Jan 10, 2014 by sreemathi.v
edited Mar 19, 2014 by mosymeow_1

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