Photoelectric effect is the phenomenon in whi | vedclass

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(D) The photoelectric effect is the emission of electrons from a metal surface when light of a suitable frequency strikes it.The energy of the inciden

Vedclass · Accepted Answer

Electrons come out of a metal with different velocities not greater than a certain value which depends only on the frequency of the incident light wave and not on its intensity.

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(D) The photoelectric effect is the emission of electrons from a metal surface when light of a suitable frequency strikes it.The energy of the incident photon is given by $E = h
u$.According to Einstein's photoelectric equation: $h
u = \Phi + KE_{max}$,where $\Phi$ is the work function and $KE_{max}$ is the maximum kinetic energy of the emitted electrons.$KE_{max} = h
u - \Phi$.Since $KE_{max} = \frac{1}{2}mv_{max}^2$,the velocity of emitted electrons ranges from $0$ to $v_{max}$.This $v_{max}$ depends only on the frequency of the incident light $(
u)$ and the nature of the metal $(\Phi)$,not on the intensity of the light.Therefore,electrons are emitted with different velocities,none of which exceed the value corresponding to $KE_{max}$.

Metal	$Li, Na, K, Mg, Cu, Ag, Fe, Pt, W$
$\phi \ (eV)$	$2.4, 2.3, 2.2, 3.7, 4.8, 4.3, 4.7, 6.3, 4.75$

Photoelectric effect is the phenomenon in which

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The work function $(\phi)$ of some metals is listed below. The number of metals which will show photoelectric effect when light of $300 \ nm$ wavelength falls on the metal is

Metal $Li, Na, K, Mg, Cu, Ag, Fe, Pt, W$

$\phi \ (eV)$ $2.4, 2.3, 2.2, 3.7, 4.8, 4.3, 4.7, 6.3, 4.75$

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