This presentation is for talk in school

1. Photo electric effect
Efforts by – Parth Khetrapal
Class – XI B
Roll no. - 15

2. Index
1. What is the Photoelectric effect
2. Experimental set-up to study photoelectric effect
3. Laws of Photoelectric effect
4. Heinrich Hertz Photoelectric effects
5. Einstein’s Photoelectric equations
6. Verifications of laws of Photoelectric theory based on Einstein

3. What is the photo electric effect
The photoelectric effect is the
emission of electrons when
electromagnetic radiation, such
as light, hits a material. Electrons
emitted in this manner are called
photoelectrons.

5. Experimental set-up to study photoelectric
effect
The experimental setup consists of:
Evacuated tube consist of photosensitive
plate (emitter) and the metal plate
(collector), so that electrons could freely
flow from emitter to collector without
any air resistance. Photosensitive plate
(emitter) to absorb visible light and emit
electrons.

6. Laws of Photoelectric effect
1. The emission of electrons from the surface
stops after a certain frequency known as
the threshold frequency.
2. The number of electrons that are emitted
from the surface is directly proportional to
the intensity of the incident light.
3. The photoelectrons' maximum kinetic
energy rises as the frequency of the
incident light rises.

7. Heinrich Hertz Photoelectric
effect
This phenomenon is called the
photoelectric effect. Heinrich Hertz, a
German physicist, discovered the
photoelectric effect in 1887. He
observed that shining an ultraviolet
light on electrodes caused a change in
the voltage between them.

9. Einstein’s Photoelectric equations
The kinetic energy of the
photoelectron coming out may be
anything between zero and (E−φ)
where E=λhc is the energy
supplied to the individual
electrons.

11. Verifications of laws of Photoelectric
theory based on Einstein
 Laws of Photoelectric Emission for a
given material and a given frequency
of incident radiation, the
photoelectric current (number of
photoelectrons ejected per second)
is directly proportional to the
intensity of the incident light.