Illuminating the surface of a certain me...

Illuminating the surface of a certain metal alternately with light of wavelengths `lambda_(1)=0.35 mu` m and `lambda-(2) =0.54 pm`, it was found that the corresponding maximum velocities of photo electrons have a ratio `eta` = 2. Find the work function of that metal:

3.22 eV

1.88 eV

5.64 eV

6.28 eV

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