Flashcards for JEE Physics - Dual Nature of Radiation and Matter Class 12

 Page 1


Dual Nature of Radiation & Matter
Flash Cards
Page 2


Dual Nature of Radiation & Matter
Flash Cards
Photo Electric Effect
When light of sufficiently high frequency is incident on a metal 
surface electrons are ejected from the metal. This phenomenon 
is called the photoelectric effect . The electrons ejected from the 
metal are called photoelectrons.
Page 3


Dual Nature of Radiation & Matter
Flash Cards
Photo Electric Effect
When light of sufficiently high frequency is incident on a metal 
surface electrons are ejected from the metal. This phenomenon 
is called the photoelectric effect . The electrons ejected from the 
metal are called photoelectrons.
Work Function ( ?) :
The minimum energy required by an electron to free itself 
from the surface of the metal is called work function of the 
metal. It is a property of the metal and is different for 
different metals.
Page 4


Dual Nature of Radiation & Matter
Flash Cards
Photo Electric Effect
When light of sufficiently high frequency is incident on a metal 
surface electrons are ejected from the metal. This phenomenon 
is called the photoelectric effect . The electrons ejected from the 
metal are called photoelectrons.
Work Function ( ?) :
The minimum energy required by an electron to free itself 
from the surface of the metal is called work function of the 
metal. It is a property of the metal and is different for 
different metals.
Threshold Energy :
The minimum energy of incident light for which photoelectric 
effect is possible is called threshold energy. Threshold energy 
and work function of a metal are equal in magnitude. Thus, 
if hv0 is the threshold energy and ? is work function of the 
material, then hv0= ?
Page 5


Dual Nature of Radiation & Matter
Flash Cards
Photo Electric Effect
When light of sufficiently high frequency is incident on a metal 
surface electrons are ejected from the metal. This phenomenon 
is called the photoelectric effect . The electrons ejected from the 
metal are called photoelectrons.
Work Function ( ?) :
The minimum energy required by an electron to free itself 
from the surface of the metal is called work function of the 
metal. It is a property of the metal and is different for 
different metals.
Threshold Energy :
The minimum energy of incident light for which photoelectric 
effect is possible is called threshold energy. Threshold energy 
and work function of a metal are equal in magnitude. Thus, 
if hv0 is the threshold energy and ? is work function of the 
material, then hv0= ?
Threshold Frequency (v0) (continued)
The minimum frequency of photons of light for which 
photoelectric effect is possible is called threshold frequency.