edassmate
Dafe
pE82Chapte RADIATION
elaswor
DUAL NAIURE OF MATTGR AND
Elechon Emission-
It is the_pYDLaSs in_whichan_bieatron_Pscape& grom
lhe mttal arface.
*WorKEuacLen
eneray required to juSE eScape an leckron from
The minimum
matal surface6 knownAs Jalork Function.
he
IYPES OF EMISSIONS
It 16 the prOcess in which eleckron_escape
1Thermionic missi.on
metal _surface hy heatingit direckly and Hhe obtained
rom the
elechronsare called field Ele.ckrons
2 SeLondary fmicsion it is the process in juhich ele.ctrons eKcape
aceeleraked electyon
from themetal surface when the highly
Incident oh the Sur{ace by the eLternalSource
3Photoelectric EmissTon It is Hhe process in which_electron escape from
the metal surface when the Tadiätion 0 Suikable frequency is
nciden on the metal surFace k he obtained e_are called
phoelectrons.
Experimentalsetup for photn elechran lect
lecto Inkensity o Inidenk radiakion
On increasing the inkensity af incident radiation (Ketping_pokenha
and frequeney constant)no. o photoelectrons emitted per seuond.
incYe.ase.S and as a YesulE o i t phohocurrenk increases_
I photocurrent
nten sit+y
, sSMA
Date
Page
Sfectstkcquency el.incidenttadiatiog
ion maxvAUm
O n IncYeAsing the requenty oF inuaenk_radiation_m
incrsases
Kin&lis unexqy ofCmitted elechron
THRESHOLD FREQUENCY
The minimum frequenty oaudent_radiation oe lou unhich
belu ahich
electonemissionS rot p0ssilbleis knoon as shold
irequency 9 NOTED
NOTE:The adiaion o heshald arequency y) hos has inerg
ane
equal to wOYk unchion ophpinsensikive _sirnface
Wo hya
GRAPHICAL REPRESENTATION OF PHOTO CURRENT
AT DIFF ERENT FREQOENCTES &POTEN
I Sakuration
Current
No-No No po
KI K , .
From ha qraph waLohsatvaiollowing As
Dhe value o stnppingpotenials d eren or
Dafe
pE82Chapte RADIATION
elaswor
DUAL NAIURE OF MATTGR AND
Elechon Emission-
It is the_pYDLaSs in_whichan_bieatron_Pscape& grom
lhe mttal arface.
*WorKEuacLen
eneray required to juSE eScape an leckron from
The minimum
matal surface6 knownAs Jalork Function.
he
IYPES OF EMISSIONS
It 16 the prOcess in which eleckron_escape
1Thermionic missi.on
metal _surface hy heatingit direckly and Hhe obtained
rom the
elechronsare called field Ele.ckrons
2 SeLondary fmicsion it is the process in juhich ele.ctrons eKcape
aceeleraked electyon
from themetal surface when the highly
Incident oh the Sur{ace by the eLternalSource
3Photoelectric EmissTon It is Hhe process in which_electron escape from
the metal surface when the Tadiätion 0 Suikable frequency is
nciden on the metal surFace k he obtained e_are called
phoelectrons.
Experimentalsetup for photn elechran lect
lecto Inkensity o Inidenk radiakion
On increasing the inkensity af incident radiation (Ketping_pokenha
and frequeney constant)no. o photoelectrons emitted per seuond.
incYe.ase.S and as a YesulE o i t phohocurrenk increases_
I photocurrent
nten sit+y
, sSMA
Date
Page
Sfectstkcquency el.incidenttadiatiog
ion maxvAUm
O n IncYeAsing the requenty oF inuaenk_radiation_m
incrsases
Kin&lis unexqy ofCmitted elechron
THRESHOLD FREQUENCY
The minimum frequenty oaudent_radiation oe lou unhich
belu ahich
electonemissionS rot p0ssilbleis knoon as shold
irequency 9 NOTED
NOTE:The adiaion o heshald arequency y) hos has inerg
ane
equal to wOYk unchion ophpinsensikive _sirnface
Wo hya
GRAPHICAL REPRESENTATION OF PHOTO CURRENT
AT DIFF ERENT FREQOENCTES &POTEN
I Sakuration
Current
No-No No po
KI K , .
From ha qraph waLohsatvaiollowing As
Dhe value o stnppingpotenials d eren or
