When incident wavelength is lamda, stopping potential is 3 Vo. If incident wavelength is 2 lambda then stopping potential is Vo. Find out threshold wavelength in terms of lambda
Preeti , 6 Years ago
Grade 11
1 Answers
Adarsh
Last Activity: 6 Years ago
Dear Preeti ,
Let the threshold wavelength be λ0 ,
Now A/Q 3V0 = hc/(λ0 – λ) …..... ( 1 )
V0= hc/(λ0 – 2λ) …....... ( 2 )
dividing 1 by 2 we get , 3 = (λ0 – 2λ) / (λ0 – λ) => λ0 = λ/2 .
Hence the threshold wavelength is half of lambda..
Thanks and Regards
Adarsh
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