Group members.
Kahkshan Mansab
Hifza Amen
Sehar Bano
Modern Physics Lab
Topic:
Photoelectric effect Experiment

HISTORICAL BAKGROUND
 In 1905, Einstein suggested an experiment that provided the first convincing
experimental verification of Quantum theory.Though photo emission of electrons
was first observed by Hertz in 1877.

INTRODUCTION
 What is photoelectric 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
 We have to prove that the velocity of electrons leaving the surface of a metal when
irradiated by monochromatic light depends upon the wavelength not upon the
intensity of the radiation .

EXPERIMENTAL SETUP

DIAGRAM

CHRACTERSTICS

APPLICATION
• Photocell.
• Solar panels.
• Automatic fire alarms.
• paper industry.
• Light meters
There are many daily life applications of Photoelectric
effectbut some of important are listed here: