Surface of certain metal... | MODERN PHYSICS |JEE MAIN 2019

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JEE Main 2019

9-01-2019 S1

Question

Surface of certain metal is first illuminated with light of wavelength $\lambda_1=350 \mathrm{~nm}$ and then, by light of wavelength $\lambda_2=540 \mathrm{~nm}$. 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

Select the correct option:

A

1.8

B

5.6

C

2.5

D

1.4

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