Physical Science P1 Additional Exemplar Memo ... - SmartLearner
Physical Science P1 Additional Exemplar Memo ... - SmartLearner
Physical Science P1 Additional Exemplar Memo ... - SmartLearner
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<strong>Physical</strong> <strong>Science</strong>s/Fisiese Wetenskappe/<strong>P1</strong>/V1 15 DoE/<strong>Exemplar</strong>/Model 2008<br />
NSC/NSS – <strong>Memo</strong>randum<br />
QUESTION 14/VRAAG 14<br />
14.1 Minimum energy needed to eject electrons from a certain<br />
material/metal. <br />
14.2<br />
14.3<br />
Minimum energie benodig om elektrone uit 'n spesifieke<br />
metaal/materiaal vry te stel. [12.2.1] (2)<br />
hc<br />
E = <br />
λ<br />
∴ 6,9 x 10 -19 =<br />
( 6,<br />
63 x10<br />
Copyright reserved/Kopiereg voorbehou<br />
−34<br />
λ<br />
)( 3 x10<br />
8<br />
)<br />
<br />
∴ λ = 288,26 x 10 -9 m = 288,26 nm [12.2.3] (4)<br />
hc<br />
Ek = - W <br />
λ<br />
−34<br />
( 6,<br />
63 x10<br />
)(<br />
= −9<br />
260 x10<br />
3 x10<br />
8<br />
)<br />
- 6,9 x 10 -19 <br />
= 7,65 x 10 -19 – 6,9 x 10 -19<br />
= 7,5 x 10 -20 J [12.1.3] (4)<br />
14.4 The positively charged zinc plate will attract electrons preventing<br />
them from being emitted. <br />
Die positief gelaaide sinkplaat sal elektrone aantrek en vrystelling<br />
verhoed. <br />
[12.2.3]<br />
(2)<br />
[12]<br />
GRAND TOTAL/GROOTTOTAAL: 150
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