1.

Surface of certain metal is first illuminated with light of wavelength λ1 = 350 nm and then, by light of wavelength λ2 = 540 nm. It is found that the maximum speed of the photo electrons in the two cases differ by a factor of 2. The work function of the metal (in eV) is close to:(Energy of photon = \(\frac{{1240}}{{\lambda \left( {in\;nm} \right)}}\) eV)

A. 1.8
B. 2.5
C. 5.6
D. 1.4
Answer» B. 2.5


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