Question

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

• A. Number of e⁻ ejected increases with the increase in the intensity of incident light
• B. Energy of e⁻ ejected increases with the increase in the intensity of incident light
• C. Number of e⁻ ejected increases with the increase in the frequency of incident light
• D. Number of e⁻ ejected increases with the increase in work function

Answer 1

The Correct Option is A

In the photoelectric effect, the number of electrons ejected from a material increases with the intensity of the incident light, as intensity is directly related to the number of photons striking the material. However, the energy of the ejected electrons is dependent on the frequency of the incident light, not the intensity. The work function (the minimum energy required to eject an electron) is a characteristic of the material and does not affect the number of electrons ejected.

The correct option is (A): Number of e⁻ ejected increases with the increase in the intensity of incident ligh

Answer 2

The photoelectric effect involves the emission of electrons from a metal surface when light of sufficient frequency (above the threshold frequency) shines on it. According to the theory of the photoelectric effect:

• The number of electrons ejected is directly proportional to the intensity of the incident light, because intensity represents the number of photons hitting the surface. More photons result in more electrons being ejected.
• The energy of the ejected electrons depends on the frequency of the incident light, not the intensity.
• The frequency of the incident light determines the energy of the ejected electrons (with higher frequency light leading to more energetic electrons), but it does not affect the number of electrons ejected.
• The work function is the minimum energy required to eject an electron. A higher work function means that light with a higher frequency (and thus higher energy) is needed to eject electrons, but it does not affect the number of electrons ejected.

Thus, the correct statement is that the number of ejected electrons increases with the increase in the intensity of the incident light.

Hence, the correct answer is (A).