Ultraviolet radiation of energy 6.2 eV falls on the surface of aluminium of work function 4.2 eV. Wh….

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Ultraviolet radiation of energy 6.2 eV falls on the surface of aluminium of work function 4.2 eV. What will be the K.E. of the fastest electron (in joule)?

Options :-

1. 3 x 10^-21
2. 3 x 10^-19
3. 4 x 10^-17
4. 3 x 10^-15

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