Photon having wavelength lambda = 3.5xx1...

Photon having wavelength `lambda = 3.5xx10^(-7)m` and `lambda = 5.4xx10^(-7)m` incident on a metal surface successively, let in both cases the ration of their stopping potential is 2 : 1, find work function :

0.98 eV

1.05 eV

3.05 eV

5.05 eV

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