SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Photons of energy 2.1 eV cause a photoelectric currenton the surface of caesium, which has a workfunction of 1.9 eV. How many times should the energyof the photon be increased in order to double themaximum kinetic energy of the photoelectrons?
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2.18
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1.09
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3.28
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4.36
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Explanation:
Detailed explanation-1: -The work function for caesium atom is 1.9 eV.
Detailed explanation-2: -E = hf = + ½mv2max f = the frequency of the incident radiation (Hz) = the work function of the material (J) ½mv2max= the maximum kinetic energy of the photoelectrons (J)
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