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Photo electric effect

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CURRICULUM FET
PHYSICAL SCIENCES
TUTOR MATERIAL
SPRING SCHOOL 2025




BACK ON TRACK PROGRAMME
GRADE 12

, TOPIC: PHOTOELECTRIC EFFECT
DATE: SEPTEMBER 2025

PRE-TEST: PHOTOELECTRIC EFFECT
QUESTION 1 (MULTIPLE-CHOICE)

1.1 B ✓✓
(2)
1.2 D ✓✓
(2)
1.3 B ✓✓
(2)
[10]



• EXAM TYPE QUESTIONS

VRAAG 2

2.1 Die foto-elektriese effek is ‘n bewys: (1)

* Van die deeltjie-geaardheid van lig (elektromagnetiese golwe) 
* Dat lig uit pakkies energie / fotone bestaan.

2.2 DRUMPELFREKWENSIE: Die minimum frekwensie lig benodig om (2)
elektrone uit ‘n sekere metaaloppervlak vry te stel. 


2.3.1 Die KLEUR van die lig verander.  (1)

2.3.2 Die HELDERHEID van die lig verander.  (1)
(Die lig word helderder / dowwer)

2.4.1 Fotone se ENERGIE neem toe / af.  (1)

2.4.2 GETAL fotone wat die katode tref neem toe / af.  (1)
c c
2.5 E = h  EN E = hf  h  = hf (3)

Enige formule OF ‘n kombinasie van die formules: 

3 x 108
(6,63 x 10-34)(330 x 10−9) = (6,63 x 10-34)f 

 f = 9,09 x 1014 Hz 



Grade 12 Tutoring Programme: Physical Sciences 2

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Uploaded on
November 21, 2025
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Written in
2025/2026
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