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Standard XIII

Chemistry

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.

2.5 e V

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5.2 e V

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10.5 e V

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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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When an electromagnetic radiation of wavelength 310 nm falls on the surface of sodium metal, electrons are emitted with K.Emax = 1.5 eV. Determine the work function Wo of metal.

The correct option is A 2.5 eVUsing Einstein's Photoelectric Equation, KEmax = E−Wo Given :KEmax = 1.5 eVλ = 310 nm = 3100 oA Again, E(eV)=12400λ(A0)=124003100=4 eV Hence from Einstein's Photoelectric equation, Wo = (4−1.5) eV=2.5 eV

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.