Bell Ringer Tues 1216 WDYS in the picture below Write down observations for the text as well as the picture WDYT what does the green team and ultraviolet team mean Pg 840 in the blue Active Physics Book ID: 365309
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Slide1
Photoelectric Effect and Quiz ReviewSlide2
Bell Ringer – Tues, 12/16
WDYS in the picture below? Write down observations for the text as well as the picture.
WDYT: what does the green team and ultraviolet team mean?
Pg
840 in the blue Active Physics BookSlide3
Bellwork – Tues, 12/16Slide4
Learning Target
We will describe the photoelectric effect and use it as evidence that light is a particle.
Standard – NGSS PS4.B.3: Photoelectric
materials emit electrons when they absorb light of a high-enough frequency. Slide5
Quiz Tomorrow
Make sure you can:
Know the types of light and their relative energies
Know which types of light cause damage to living cellsDescribe how a magnet is used to form an electric current
Describe how an electric current is used to form a magnetic fieldDescribe how light is a WAVE
and
a PARTICLESlide6
Agenda
Bellwork
What is the photoelectric effect?
Vending Machine Stations
Solar Cells Reading
Exit Slip
(Wave vs. Particle Reading)Slide7
What is the photoelectric effect?
Photoelectric effect – process by which electrons are released when electromagnetic radiation shines on the surface of a metal
It’s kind of like a vending machineSlide8
Old Vending Machine Rules
A bag of potato chips costs 10¢
If
y
ou add . . .
The
machine will . . .
10¢
Give you a bag of potato chips
5¢
Return your 5¢
25¢
Give you a bag of potato chips AND give you 15¢ in change
2 nickels
Return
your nickels (it can’t add coins)Slide9
Old Vending Machine Rules
In your groups:
Open your folder
Read what you add to the machinePredict what the machine will do!Slide10
Photoelectric Effect Rules
Read page 843, last two bullets
Read page 844, first columnSlide11
Old Theory
Observations
New Theory
Light
is a wave!
With higher amplitude, electrons should have higher energy
With low amplitude, electrons should take a long time to be emitted
Photoelectric Effect
Sim
Old Theory
Observations
New Theory
Light
is a wave!
With higher amplitude, electrons should have higher energy
With low amplitude, electrons should take a long time to be emitted
???????????
With higher amplitude, MORE electrons leave
with the SAME energy
With low amplitude, there is NO delay
Old Theory
Observations
New Theory
Light
is a wave!
With higher amplitude, electrons should have higher energy
With low amplitude, electrons should take a long time to be emitted
???????????
With higher amplitude, MORE electrons leave
with the SAME energy
With low amplitude, there is NO delay
Light is a particle!
Energy of
the electrons depends only on FREQUENCY
Each
photon
can only move ONE electronSlide12
Photoelectric Effect Theory
QUANTUM theory
Light
is a particle
!
Energy of the electrons depends only on
FREQUENCY
Each
photon
can only move ONE electronSlide13
Reading: PhysicsTalk
pg
846As you read, make a t-chart in your notebook that compares properties of PARTICLES to properties of WAVESSlide14
Exit Slip
How does the photoelectric effect show that light is a particle?