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Quantum Numbers

The energy of...

Question

The energy of the photons causing the photoelectric emission is

A

2.55 e V

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B

0.73 e V

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C

1.82 e V

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D

Information insufficient

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Solution

The correct option is C $2.55 e V$
Given, work function for Sodium is $1.82 e V$ and $K . E$ of fastest electron emitted is $0.73 e V$ .
Total energy incident on Sodium is $2.55 e V .$

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