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Sodium and copper have work function 2.3 eve and 4.5 ev. Then the ratio of the wavelength is nearest to

Sodium and copper have work function 2.3 eve and 4.5 ev. Then the ratio of the wavelength is nearest to
 

Grade:12th pass

1 Answers

Eshan
askIITians Faculty 2095 Points
5 years ago
Dear student,

I suppose the question is asking about the ratio of cut-off wavelengths of the two metals.

We know thatW_0=h\nu=\dfrac{hc}{\lambda}
HenceW_0\propto \dfrac{1}{\lambda}
\implies \dfrac{\lambda_1}{\lambda_2}=\dfrac{4.5}{2.3}=1.96

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