Question

With regard to photoelectric effect, identify the correct statement among the following

• A. Energy of $e^{-}$ ejected increases with the increase in the intensity of incident light
• B. Number of $e^{-}$ ejected increases with the increase in the frequency of incident light
• C. Number of $e^{-}$ ejected increases with the increase in work function
• D. Number of $e^{-}$ ejected increases with the increase in the intensity of incident light

Answer 1

Answer: (D)

Photoelectric effect is the emission of electrons from a certain metal surface when it is irradiated with photons or light. The minimum frequency required to eject an electron from a metal surface is called threshold frequency. $\left(v_0\right)$

The equation for the photoelectric effect is:

$HU=h{v}_0+KE$, where $v=$ frequency of the incident radiation

Here $h{v}_0$ is the work function. The number of electrons ejected does not depend on work function.

The number of electrons ejected increases with the increase in the intensity of incident light, an increase in the intensity of incident light means that the number of photons incident per unit surface area of the metal increases. (Provided the incident photons has its frequency more than the threshold frequency)

The energy of the ejected electrons increases with an increase in the frequency of incident light.