The work function of the target material is 1-24 eV and the wavelength of incident light is 4360 A- What retarding potential is necessary to stop the emission of the electrons-A- 1-61 VB- 2-61 VC- 3-61 VD- 4-61 V

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Work Function

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Question

The work function of the target material is $1.24 e V$ and the wavelength of incident light is $4360 \circ A$ . What retarding potential is necessary to stop the emission of the electrons?

1.61 V

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2.61 V

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3.61 V

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4.61 V

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Solution

The correct option is A $1.61 V$
Maximum kinetic energy of the emitted electrons is given by
$E = ϕ + K . E_{m a x}$
where $E$ = energy of incident radiation $= \frac{12431}{λ (in \circ A)} e V = \frac{12431}{4360} e V = 2.85 e V$
and $ϕ =$ work function of material $= 1.24 e V$

Therefore, $K . E_{m a x} = 2.85 - 1.24 = 1.61 e V$

Retarding/Stopping potential is the minimum reverse potential that must be applied to completely stop the movement of electrons.
If $V_{0}$ is stopping potential, $e V_{0} = 1.61 e V$
i.e $V_{0} = 1.61 V$

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The work function of the target material is 1.24 eV and the wavelength of incident light is 4360 ∘A. What retarding potential is necessary to stop the emission of the electrons?

The work function of the target material is $1.24 e V$ and the wavelength of incident light is $4360 \circ A$ . What retarding potential is necessary to stop the emission of the electrons?