Page 244 - Physics Form 5 KSSM_Neat

7.2 Photoelectric Effect Light

When a metal surface is illuminated by a beam of
light at a certain frequency, electrons can be emitted
from the metal. This phenomenon is known as Electrons
photoelectric effect. emitted
KEMENTERIAN PENDIDIKAN MALAYSIA
Metal surface
Figure 7.6 Photoelectric effect

Activity 7.4 ISS ICS

Aim: To study photoelectric effect
Instructions:
SCAN ME
1. Carry out this activity in pairs. SCAN ME
Simulation of
2. Scan the QR code to watch a simulation on photoelectric
photoelectric effect. effect
3. Based on the simulation, study photoelectric effect.
http://bit.ly/2SGY8PM
4. Present your findings.

SCAN ME
The characteristics of photoelectric effect can be studied by SCAN ME
arranging a photocell in the circuit as shown in Figure 7.7. Demonstration
video of
photoelectric
effect
When a light sensitive metal surface https://bit.ly/2EsWSuu
(cathode) is illuminated with a certain
1 light beam, electrons will be emitted
from the metal surface. These electrons
are called photoelectrons. Photocell
Light
source
Light
e - sensitive
2 e - e - e - 1 metal
2 The emitted photoelectrons are attracted Anode + e - e - _ Cathode
to the anode which has positive potential.
Vacuum

The movement of the photoelectrons 0 1 2 3 mA 4 5 6 3
from the cathode to the anode + _
3 produces a current inside the circuit.
The milliammeter shows the value of Battery Milliammeter
the current.

Figure 7.7 Apparatus to show photoelectric effect

234 LS 7.2.1