wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

An external electric field is applied on a metal plate, high enough to force the electrons to eject out of the surface. Is this an example of Photo electric effect?


A

True

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

False

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is B

False


There are various ways to transfer the sufficient energy to free electrons in a metal and make them leave the surface.

(a) Thermionic emission: The metal surface is heated until the electrons gain sufficient energy to come out.

(b) Field emission: High electric field is applied across the metal to pull out the electrons

(c) Secondary emission: A high energy electron is made to hit the plate thereby transferring sufficient energy to other electrons to come out.

(d) Photo electric emission is another way in which light with sufficient energy is shone on a plate and the electrons absorb this energy to eject out of the metal surface.


flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Light as Wave
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon