Planck's Constant & Work Function

[physicoo]

Hi guys,

I am currently in doubt with the relationship between the stopping potential and the intensity of light.

Theoretically, I understand there should not be a relationship between these two variables, given that stopping potential is completely independent of light intensity.

However, I read a site where experimental findings said otherwise, but only because of the work function depending on the light intensity, where decreasing stopping potential were due to the change in the work function. I tried searching and forming equations to see how that was derived but to no avail. Could it be due to the apparatus used in the experiments?

Cheers!

 

[anathema]

Hello,

Thank you for bringing up this interesting topic. I can offer some insights and clarification on the relationship between stopping potential and light intensity.

Firstly, it is important to understand the concept of stopping potential. Stopping potential is the minimum potential difference that must be applied to a metal surface to prevent the emission of electrons from the surface. It is directly related to the work function of the metal, which is the minimum energy required to remove an electron from the surface of the metal.

Now, let's consider the effect of light intensity on the work function. The work function is a characteristic property of a metal and is not affected by the intensity of light. However, when light falls on a metal surface, it can cause the emission of electrons through the photoelectric effect. This means that the light can provide the necessary energy to overcome the work function and release electrons from the metal surface.

In experiments, the intensity of light can be controlled by adjusting the distance between the light source and the metal surface. When the distance is increased, the intensity of light decreases and thus, the number of electrons emitted also decreases. This results in a decrease in the stopping potential as fewer electrons need to be stopped.

It is worth noting that the relationship between stopping potential and light intensity is not a direct one. It is indirect, as the change in light intensity affects the number of emitted electrons, which in turn affects the stopping potential.

In conclusion, the relationship between stopping potential and light intensity is not a fundamental one. It is a result of the photoelectric effect and can vary depending on the experimental conditions. I hope this helps to clarify any doubts you may have. Keep exploring and questioning the world around you!