How to find work function from max kinetic energy vs frequency of proton graoh

Answer 1

To find the work function of a material from a graph of the maximum kinetic energy vs the frequency of protons, you can use the following procedure:

1. Identify the point where the maximum kinetic energy is zero on the graph. This point corresponds to the threshold frequency, below which no photoelectrons are emitted.

2. Find the frequency corresponding to this point on the x-axis of the graph.

3. Use the equation for the maximum kinetic energy of a photoelectron: K.E. = hf - Φ, where K.E. is the maximum kinetic energy, h is the Planck constant, f is the frequency of the incident photons, and Φ is the work function of the material.

4. Substitute the values of the threshold frequency and the corresponding maximum kinetic energy into the equation to solve for the work function Φ.

5. The work function of the material can be calculated using the formula Φ = hf - K.E.

By following these steps, you can determine the work function of the material from the graph of the maximum kinetic energy vs frequency of protons.