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Question
Draw a graph between the frequency of incident radiation (υ) and the maximum kinetic energy of the electrons emitted from the surface of a photosensitive material state clearly how this graph can be used to determine (i) Planck’s constant and (ii) work function of the material.
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Solution
(i) Plank constant is given by slope of the curve i.e.
`h =(ΔKE)/(Deltav)`
(ii) Work function is the minimum energy required by the electron to escape out of the metal surface thus,
Φ = hν° Here, ν° is the threshold frequency
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