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Photoelectric Effect

When an elect...

Question

When an electromagnetic radiation of wavelength $310 n m$ falls on the surface of sodium metal, electrons are emitted with $K . E_{m a x} = 1.5 e V$ . Determine the work function $W_{o}$ of metal.

A

2.5 e V

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B

5.2 e V

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C

10.5 e V

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D

12.5 e V

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Solution

The correct option is A $2.5 e V$
Using Einstein's Photoelectric Equation,
$K E_{m a x} = E - W_{o}$
Given : $K E_{m a x} = 1.5 e V$ $λ = 310 n m = 3100 o A$
Again,
$E (e V) = \frac{12400}{λ (A^{0})} = \frac{12400}{3100} = 4 e V$
Hence from Einstein's Photoelectric equation,
$W_{o} = (4 - 1.5) e V = 2.5 e V$

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Photoelectric Effect

Standard XIII Chemistry

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