Question

The photoelectric work function
A. Is different for different metals
B. Is same for all metals
C. Depends upon frequency of incident light
D. Depends upon intensity of incident light

Answer 1

Hint: First let us see what photoelectric work function is:
The work function is the basic thermodynamic work expected to eliminate an electron from a material to a point in open outside of the material.

Complete step by step answer:
The work is certainly not a trait of a mass material, but instead a property of the outside part of the material, and thus is not the same for various metals.
Various metals have diverse work functions. This implies it is simpler to eliminate electrons from certain metals than others. Thus, this implies that the minimum frequency of photons expected to eliminate an electron from one metal can be lower than for another metal.
Work functions rely upon the structure and synthetic composition of a surface. For instance, extraordinary crystallographic surfaces of a similar metal or compound can have considerably unique work capacities. Compound alterations of a surface can have significantly bigger outcomes.

Hence, from the above discussion it can be concluded that option A is correct.

Additional information:
Photoelectric effect can be explained as: it takes a specific energy to launch an electron from a metal surface. This energy is the work function which relies upon the metal. Electrons can pick up energy by collaborating with photons. On the chance that a photon has energy as large as the work function, the photon energy can be moved to the electron and the electron will have enough energy to escape from the metal. A photon with energy not exactly equal to the work function will always be unable to launch electrons.

Note:Here we may get some confusion between options A and C, D. But we have to remember that though work function is related to photoelectric effect, it does not depend on frequency and intensity of light.