A photon can eject an electron from the surface of a photo-voltaic metal. Identify which of the following is must condition for above statement.

The frequency of the photon is above the activation minimum

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The wavelength of the photon is above the activation minimum

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The speed of the photon is above the activation minimum

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The momentum of the photon is below the activation minimum

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The momentum of the impacted electron is above the activation minimum

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Solution

The correct option is A The frequency of the photon is above the activation minimum
According to Einstein's Photoelectric effect, the maximum kinetic energy of an ejected electron when a photon of energy $h ν$ strikes a metal of work potential $W_{0}$ is $K E = h ν - W_{0}$
Thus for photoelectric effect to take place,
$K E > 0$
$⟹ h ν - W_{0} > 0$
$⟹ ν > \frac{W_{0}}{h}$

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P = \frac{h}{λ}

λ

P = \frac{h}{λ}

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E_{e} = K . E

E_{P h} = K . E

P_{e} =

P_{p h} =

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