Question

A radiation of wave length 3000A° is required to remove an electron from a metal atom. In a radiation of wave length 2000A° is allowed to impact on the metal surface, the kinetic
energy of the emitted electron in KJ/mole is
1) 1.98x10^2
2) 3.3x10^-19
3) 3.3x10^-20
4) 19.8

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Answer 1

Option 2) is the right answer.

Refer attachment for explanation!!!