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Summary Chapter 2: EM radiation and Quantum Phenomena

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  • Course
  • Physics A-level
  • Institution
  • Bachillerato
  • Book
  • A-Level Physics for AQA

Section 2- EM radiation and Quantum phenomena. It is part of the A(S)-level syllabus. It includes: photoelectric effect, energy levels and photon emission and wave-particle duality

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  • No
  • Chapter 2
  • January 25, 2023
  • 4
  • 2022/2023
  • Summary

Subjects

  • physics
  • physics a level
  • physics as level
  • aqa
  • section 2
  • a level
  • year 12
  • physics aqa
  • chapter 2 em radiation and quantum phenomena

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-




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
'




?⃝

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