-
HE PHOTO ELECTRIC EFFECT :
Vertical/ y Pdarised microwave
negative charged metal plaie
°
min
o visible light , nothing happeus
UV light discharges electro Scope
° > .
Max
> Below threshold
frequency NO emission of PHOTOELECTRONS
regardless of intensity
: .
,
Above threshold
frequency of
> : Emmission photoelectrons .
0
Increasing the inleusity yields more pnaoelecroos .
-
different metals have difeeut threshold fequencies
When metal :
tight Shines on a
°
higher the amplitud > more
energy transported
tight arrives in
"
lumps
"
or quanta ,
we call photons .
Energy of a proton of
frequencyf
: E =
hf h =
6.63×10-3
"
JS ( Plank 's Constant)
F- =
hxf
quantum E =
energy of photon ( J )
of electro Magnetic
radiadion or PHOTON . h =
Planck
'
S Constant
The of one proton
energy
of
f- frequency
=
of electro magnetic radiation ( Hz)
THRESHOLD FREQUENCY
1 to I inter action
Photon >
electrón
"P
:
E hf
'
# =
Js
"
h = 6-63×10
-
1- el/ = 1.6×10
- "
J
hf
Photon > Electron :
^
hf =
O + KE
Kinetic
energy of Photon workfunction + O function energy required for electron to Have the Surface of a metal
= =
work = an
ÉÉ
.
energy
( usual / y given in et)
MCT AL
1) f fo =
threshold frequency 2) f =
fo 3) f fo
hf O >
NO emission of photo electron hf =
O > KE =
O hf =
O t KE
° It you know to ,
can be cakulaled .
°
The electron Kare the Surface of the metal and more .
°
If o is known , to can be calculakd .
KE =
¿ mv
'
?⃝
HE PHOTO ELECTRIC EFFECT :
Vertical/ y Pdarised microwave
negative charged metal plaie
°
min
o visible light , nothing happeus
UV light discharges electro Scope
° > .
Max
> Below threshold
frequency NO emission of PHOTOELECTRONS
regardless of intensity
: .
,
Above threshold
frequency of
> : Emmission photoelectrons .
0
Increasing the inleusity yields more pnaoelecroos .
-
different metals have difeeut threshold fequencies
When metal :
tight Shines on a
°
higher the amplitud > more
energy transported
tight arrives in
"
lumps
"
or quanta ,
we call photons .
Energy of a proton of
frequencyf
: E =
hf h =
6.63×10-3
"
JS ( Plank 's Constant)
F- =
hxf
quantum E =
energy of photon ( J )
of electro Magnetic
radiadion or PHOTON . h =
Planck
'
S Constant
The of one proton
energy
of
f- frequency
=
of electro magnetic radiation ( Hz)
THRESHOLD FREQUENCY
1 to I inter action
Photon >
electrón
"P
:
E hf
'
# =
Js
"
h = 6-63×10
-
1- el/ = 1.6×10
- "
J
hf
Photon > Electron :
^
hf =
O + KE
Kinetic
energy of Photon workfunction + O function energy required for electron to Have the Surface of a metal
= =
work = an
ÉÉ
.
energy
( usual / y given in et)
MCT AL
1) f fo =
threshold frequency 2) f =
fo 3) f fo
hf O >
NO emission of photo electron hf =
O > KE =
O hf =
O t KE
° It you know to ,
can be cakulaled .
°
The electron Kare the Surface of the metal and more .
°
If o is known , to can be calculakd .
KE =
¿ mv
'
?⃝
