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Ultraviolet radiations of 6.2 eV falls on an aluminium surface. Kinetic energy of fastest electrons emitted is (work function = 4.2 eV) |
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Answer» `3.2 xx 10^(-21)` J `= 2.0 eV = 2.0 xx 1.6 xx 10^(-19) j = 3.2 xx 10^(-19) J` |
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