Choose the correct option among the following, regarding work function ϕ of material in a photoelectric effect

CONCEPT:

Photoelectric effect: When electromagnetic radiation hits a material, electrons are emitted, this effect is known as the Photoelectric effect.

Electrons emitted in this manner are called photo-electrons.

Max Kinetic energy of these photo-electrons is given by:

⇒ K.E.max = h f - ϕ 

Where h = Planck constant, f = frequency of the incident light, or electromagnetic radiation, and ϕ = work function

The work function is the property of the material.

Explanation:

The maximum kinetic energy of the photo-electron is given by 

K.E.max = h f - ϕ 

where h is the Planck constant f is the frequency of the incident light or electromagnetic radiation. The term ϕ is the work function.

And from the above explanation, we can see that workfunction is the property of a material.

Additional Information

The observations and results of the experimental study of photoelectric effect are collectively called Laws of photoelectric emission and are as follows:

1. The number of photoelectrons that are emitted from the metal depends on the intensity of the incident light but is independent of its frequency. Therefore, option 3 is not true.
2. The photoelectrons are emitted immediately after light falls on the metal.
3. For the emission of electrons, it is important that the frequency of incident light should be more than the critical value of the metal which is called the threshold frequency of the metal.