Why is the photocell experiment important?

The photocell experiment therefore enables us to determine the threshold frequency, Plank’s constant, the maximum kinetic energy of the photoelectrons, and the work function of the metal using a straightforward experimental setup. The photoelectric effect is an important phenomenon that provides evidence of the particle nature of light.

How do you calculate the energy of a photoelectric wave?

The photon’s energy is equal to the sum of the metal’s threshold energy and the photoelectron’s kinetic energy. Thus, the equation of photoelectric wave is given by, KEmax = hv–ϕ where, hv is the energy of the photon. Work function is determined by the metal in question, and it will change if the metal is changed.

How do you test a photocell?

Open the photocell enclosure and observe the photocell itself, not-ing the height and orientation of the anode ring. Be sure that the photocell is properly aligned with your optical path. FIG. 1. Experimental arrangement for measuring the photo-electric e ect. The lens focuses the light to avoid hitting the anode ring.

How do you adjust a photoelectric cell?

Adjust the wavelength control until the yellow line is visible. Place the photoelectric cell on the stand forming a light tight seal with the monochromator. Turn the “voltage adjust” control fully clockwise (maximum retarding potential) and then switch on the power switch.

What happens if a photocell ejects an electron from the cathode?

Inside the photocell there is a metal coated cathode. The annular anode is placed opposite to the cathode. When a photon of frequency strikes the cathode, then an electron can be ejected from the metal (external photoelectric effect) provided the photon has sufficient energy. Under the condition of single photon absorption by an electron

How to use a filter in a photoelectric cell?

Place a filter in front of the photoelectric cell. Keeping the voltage constant and position of photocell fixed, increase the distance of lamp from photo-cell in small steps. In case note the position of the lamp r on the optical bench and the current I. The experiment may be repeated with other filters (at least 2 filters).