A mixture of three wavelength lambda 1 lambda 2 and lambda 3 - -lambda1 gt-lambda2 gt-lambda3- is made to incident nbsp-on metal surface of threshold wavelength lambda 2 - it the number of photons of each wavelength is 10-6 and eficiancy nbsp- of photo electric effect is 1

Dear Student, From The given data For #160;the #160;given #160;three #160; #955; #160;valuesonly #160; #955;3 #160;produce #160;photo #160 ...

a mixture of ...

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
$F o r t h e g i v e n t h r e e λ v a l u e s o n l y λ_{3} p r o d u c e p h o t o e m i s s i o n s a s i t h a s m o r e e n e r g y c o m p a r e d t o λ_{2} (t h r e s h o l d) E = \frac{h c}{λ} A S S U M P T I O N : I f t h e w a v e l e n g t h λ_{3} P r o d u c e 10^{6} p h o t o n s b e c a u s e o f η = 0.01 N o o f p h o t o n s e m i t t e d = 10^{6} \times 0.01 = 10^{4} p h o t o n s$

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