Question

During the ejection of electrons in the presence of light, when the
frequency of light used is increased, then
a) K.E of ejected electrons decreases.
b) K.E of ejected electrons increases
c) Threshold frequency increases
d) Threshold frequency decreases

Answer 1

Answer:

Threshold frequency increases

Explanation:

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Answer 2

Option c) During the ejection of electrons in the presence of light, when the frequency of light used is increased, then Threshold frequency increases

Explanation:

• During the ejection of electrons in the presence of light, from the metal surface as a beam of light with certain energy strikes the surface this process is known as the Photoelectric effect.

• The appropriate energy will be a threshold that strikes the surface.

• Here in the photoelectric effect, a given metal has a certain threshold frequency which is required for the ejection of electrons.

• Threshold energy is known as the work function of the metal and the excess of energy will get converted into the kinetic energy of the photoelectron.
• As each photon can eject one electron from the surface, the number of electrons ejected will depend on the number of photons striking per unit area.
• As the energy is more the change in kinetic energy also takes place.