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I vs V - Varying Intensity

Light from a ...

Question

Light from a discharge tube containing hydrogen atoms falls on the surface of a piece of sodium. The kinetic energy of the fastest photoelectrons emitted from sodium is $0.73 e V$ , The work function for sodium is $1.82 e V$ . Find the energy of the photons causing the photoelectric emissions.

A

2.54 e V

.

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B

3.6 e V

.

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C

4.7 e V

.

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D

9 e V

.

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Solution

The correct option is D $2.54 e V$ .
The energy of photon causing photoelectric emission $=$ Work function of sodium metal $+$ $K E$ of the fastest photoelectron
$= 1.82 + 0.73 = 2.55 e V$

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Q. Light from a discharge tube containing hydrogen atoms falls on the surface of a piece of sodium. The kinetic energy of the fastest photoelectron emitted from sodium is 0.73 eV. The work function for sodium is 1.82 eV. Find the energy of the photons causing the photoelectric emission.

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