InterviewSolution
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InterviewSolution
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Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured material. The threshold frequency of the material isA. `2.5 xx 10^(15) Hz`B. `4 xx 10^(15) Hz`C. `5 xx 10^(15) Hz`D. `1.6 xx 10^(15) Hz` |
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Answer» Correct Answer - D Energy released from emission of electron `E = (-3.4) - (-13.6) = 10.2 eV` From photo electric equation. Work function `phi = E = eV = hv` `v = (E - eV)/(h) = ((10.2 - 3.57)e)/(6.67 xx 10^(-34))` `v = (6.63 xx 1.6 xx 10^(-19))/(6.67 xx 10^(-34)) = 1.6 xx 10^(15) Hz` |
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