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Analysis of Force Equation

If stopping p...

Question

If stopping potentials corresponding to wavelengths $4000$ $A^{0}$ and $4500$ $A^{0}$ are $1.3 V$ and $0.9 V$ respectively, then the work-function of the metal is

0.3 e V

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1.3 e V

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1.8 e V

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5 e V

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Solution

The correct option is C $1.8 e V$
hc/lambda=work function + Stopping potential*charge of electron.
work function $= 3.1 e V - 1.3 e V = 1.8 e V .$

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