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Define the term ‘work function’ of a metal. The threshold frequency of a metal is f0. When the light of frequency 2f0 is incident on the metal plate, the

maximum velocity of electrons emitted is V1. When the frequency of the incident radiation is increased to 5f0, the maximum velocity of electrons emitted is V2. Find the ratio of V1 to V2.


 The work function of a metal is the minimum energy required by an electron to just escape from the metal surface so as to overcome the restraining forces at the surface. As f0 is the threshold frequency, therefore, Φ0 = hf0 Using Einstein’s photoelectric equation, we obtain
0 0 0
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