Determine the planks constant using the photoelectric effect

1. MY NAME IS
AMEER HAMZA
ROLL NO 3
ASLAM-U-ALIKUM
RESPECTIVE MA’AM
AND STUDENTS

2. DETERMINETHE
PLANKS CONSTANT
USING
PHOTOELECTRIC EFFECT

3. PHOTOELECTRIC
EFFECT

4. APPRATUS:
■ Power supply
■ Variable battery
■ Photocell
■ Light source
■ Filters of different colors
■ Volt meter
■ ammeter

5. PHOTOELECTRIC EFFECT
 Conversion of light energy into the electrical energy under some
specific conditions is called photo electric effect.
 The device which convert the light energy in to the electrical
energy is called photocell
 The minimum frequency of incident light which can cause
photoelectric emission is called threshold frequency

6. EINSTINE PHOTO ELECTRICAL
EQUATION
p
h
o
t
o
n
nucleus
 Minimum energy required to eject the electron from the metal surface is called
work function
 𝐸 𝑝 = 𝜙0 + 𝑘 ⋅ 𝐸max
 ℎ𝑣 = ℎ𝑣0 + 𝑘 ⋅ 𝐸max
E=ℎ𝑣

7. METAL
electron
CURRENT
ELECTRONIC CURRENT

8. +- - +

9. source
Filter
Light
Anode
Cathode
Photo cell
Voltmeter
Ammeter
Variable battery
+- - +

10. source
Filter
Light
Anode
Cathode
Photo cell

11. Anode
Cathode
Photo cell
𝑒−1

12. source
Filter
Light
Anode
Cathode
Photo cell
Voltmeter
Ammeter
Variable battery
+- - +
𝑒−1
A B
I

13. source
Filter
Light
Anode
Cathode
Photo cell
Voltmeter
Ammeter
Variable battery
+- - +
𝑒−1
A
B

14. source
Filter
Light
Anode
Cathode
Photo cell
Voltmeter
Ammeter
Variable battery
+- - +
𝑒−1
A
B

15. ■ The potential difference at which photo current equal to zero is called stopping
potential
■ It is denoted by 𝑉0
■ The product of stopping potential ad charge on electron is called K.E max
■ Kemal = e 𝑉0

16. EXPERIMENTAL RESULTS
INTENSITYVARIATION
■ Photoelectric effect does not
depend upon the intensity of light
FREQUENCYVARIATION
■ Photoelectric effect depend upon
the frequency of light

17. THANKYOU