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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 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.

A

2.55 e V

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B

7.55 e V

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C

3.55 e V

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D

1.55 e V

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Solution

The correct option is A $2.55 e V$
$E_{k} = 0.73 e V, W = 1.82 e V$
Ionization energy of H atom $= 13.6 e V$
$h v = W + E_{k} = 1.82 e V + 0.73 e V = 2.55 e V$

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