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InterviewSolution
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The threshold frequency v, for a metalis 7.0 x1014 s. Calculate the kineticenergy of an electron emitted whenradiation of frequency v-1.0 x10 shits the metal15 -l |
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Answer» If frequency of radiation =1.0x 10^¹⁵s⁻¹Energy of radiationis equal to Planck's Constant(6.626 x10^⁻³⁴m²kg / s) multiplied by frequencyEnergy of radiation=6.626 x 10^⁻¹⁹ J An electron on the surface requires a certain amount of energy to free itself from the atom. That energy is (Threshold frequency x Planck's constant)Energy to free electron=4.638 x 10^⁻¹⁹ J Kinetic Energy of electron= Energy of radiation-Energy to free electron KE=1.988 x 10^⁻¹⁹ J≈ 2 x 10^⁻¹⁹ J |
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