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Work Function

Figure repres...

Question

Figure represents a graph of kinetic energy 'K' of photoelectrons and frequency 'v' for a metal used for cathode in photoelectic experiment. The work fuction of metal is

A

1 ev

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B

1.5 ev

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C

2 ev

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D

3 ev

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Solution

The correct option is B 1 ev
Using Einstein's equation ,
$E_{K} = h ν - W_{0}$
on compairin with $y = m x + c$
we get $W_{0} = - c$
ie, from the given graph
$W_{0} = - (- 1) = 1 e v$

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