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In a series of photoelectric emission experiments, a number of different metals were illuminated with monochromatic light of a number of different photon energies and of different intensities. The variables in the experiment were thus:

(1) Work function (2) Photon energy and (3) light intensity

It was found that, for each experiment, the emitted electrons emerged with a spread of kinetic energies up to a certain maximum value. This maximum kinetic energy depends on

$\begin {array} {1 1} (a)\;1 \: only & \quad (b)\;1 \: and \: 2 \: only \\ (c)\;1\: and \: 3 only & \quad (d)\;1,2 \: and\: 3 \end {array}$

Can you answer this question?

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Ans : (b)
An increase in light intensity causes more electrons to be emitted,
but their individual kinetic energies are not increased by the
increase of light intensity.

answered Dec 31, 2013
edited Mar 13, 2014

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