Question

# a mixture of three wavelength lambda 1 lambda 2 and lambda 3 , (lambda1>lambda2>lambda3) is made to incident on metal surface of threshold wavelength lambda 2 . it the number of photons of each wavelength is 10^6 and eficiancy of photo electric effect is 1%, calculate the number of photo emitted

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Solution

## Dear Student, From The given data $Forthegiventhree\lambda values\phantom{\rule{0ex}{0ex}}only{\lambda }_{3}producephotoemissionsasithasmoreenergycomparedto{\lambda }_{2}\left(threshold\right)\phantom{\rule{0ex}{0ex}}E=\frac{hc}{\lambda }\phantom{\rule{0ex}{0ex}}ASSUMPTION:Ifthewavelength{\lambda }_{3}Produce{10}^{6}photons\phantom{\rule{0ex}{0ex}}becauseof\eta =0.01\phantom{\rule{0ex}{0ex}}Noofphotonsemitted={10}^{6}×0.01={10}^{4}photons$

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