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The Photon Model

In a photoele...

Question

In a photoelectric effect experiment, for radiation with frequency $υ_{0}$ with $h υ_{0} = 8 e V$ , electrons are emitted with energy 2 eV. What is the energy of the electrons emitted for incoming radiation of frequency $1.25 υ_{0}$ ?

A

1 eV

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B

3.25 eV

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C

4eV

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D

9.25eV

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Solution

The correct option is B 4eV
Photoelectric Effect
$K E_{m a x} = h v_{o} - W_{o}$
$2 e v = 8 e V - W_{o}$
$W_{o} = 6 e V$
Now for frequency $1.25 v_{o}$
$K E_{m a x} = 1.25 h v_{o} - W_{o}$
$K E_{m a x} = 1.25 (8) - 6 e V = 4 e V$

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