NATIONAL
SENIOR CERTIFICATE/
NASIONALE
SENIORSERTIFIKAAT
GRADE/GRAAD 12
SEPTEMBER 2023
PHYSICAL SCIENCES P1/
FISIESE WETENSKAPPE V1
MARKING GUIDELINE/NASIENRIGLYN
MARKS/PUNTE: 150
This marking guideline consists of 16 pages./
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Physical Sciences Grade 12 P1 Eastern Cape Mock 2023 Memo
Grade 12 Physical Sciences Paper 1 memorandum from the Eastern Cape Mock Exam 2023 (English), 16 pages. Read online or download the free PDF.
Physical Sciences · Grade 12 · Eastern Cape Mock Exam · 2023 · English. Memorandum, 16 pages. Read online or download the PDF.
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2 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2023)
GENERAL GUIDELINES/ALGEMENE RIGLYNE
1. CALCULATIONS/BEREKENINGE
1.1 Marks will be awarded for: correct formula, correct substitution, correct
answer with unit.
Punte sal toegeken word vir: korrekte formule, korrekte substitusie, korrekte
antwoord met eenheid.
1.2 No marks will be awarded if an incorrect or inappropriate formula is used,
even though there are many relevant symbols and applicable substitutions.
Geen punte sal toegeken word waar ʼn verkeerde of ontoepaslike formule
gebruik word nie, selfs al is daar relevante simbole en relevante substitusies.
1.3 When an error is made during substitution into a correct formula, a mark will
be awarded for the correct formula and for the correct substitutions, but no
further marks will be given.
Wanneer ʼn fout gedurende substitusie in ʼn korrekte formule begaan word,
sal ʼn punt vir die korrekte formule en vir korrekte substitusies toegeken word,
maar geen verdere punte sal toegeken word nie.
1.4 If no formula is given, but all substitutions are correct, a candidate will
forfeit one mark.
Indien geen formule gegee is nie, maar al die substitusies is korrek, verloor
die kandidaat een punt.
1.5 No penalisation if zero substitutions are omitted in calculations where
correct formula/principle is correctly given.
Geen penalisering indien nulwaardes nie getoon word nie in berekeninge
waar die formule/beginsel korrek gegee is nie.
1.6 Mathematical manipulations and change of subject of appropriate formulae
carry no marks, but if a candidate starts off with the correct formula and then
changes the subject of the formula incorrectly, marks will be awarded for the
formula and correct substitutions. The mark for the incorrect numerical answer
is forfeited.
Wiskundige manipulasies en verandering van die onderwerp van toepaslike
formules tel geen punte nie, maar indien ʼn kandidaat met die korrekte formule
begin en dan die onderwerp van die formule verkeerd verander, sal die punte
vir die formule en korrekte substitusies toegeken word. Die punt vir die
verkeerde numeriese antwoord word verbeur.
1.7 Marks are only awarded for a formula if a calculation has been attempted,
i.e. substitutions have been made or a numerical answer given.
Punte word slegs vir ʼn formule toegeken indien ʼn poging tot berekening
aangewend is, d.w.s. substitusies is gedoen of ʼn numeriese antwoord is
gegee.
1.8 Marks can only be allocated for substitutions when values are substituted into
formulae and not when listed before a calculation starts.
Punte kan slegs toegeken word vir substitusies wanneer waardes in formules
ingestel word en nie vir waardes wat voor ʼn berekening gelys is nie.
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(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 3
1.9 All calculations, when not specified in the question, must be done to a minimum
of two decimal places.
Alle berekenings, wanneer nie in die vraag gespesifiseer word nie, moet tot ʼn
minimum van twee desimale plekke gedoen word.
1.10 If a final answer to a calculation is correct, full marks will not automatically be
awarded. Markers will always ensure that the correct/appropriate formula is
used and that workings, including substitutions, are correct.
Indien ʼn finale antwoord van ʼn berekening korrek is, sal volpunte nie outomaties
toegeken word nie. Nasieners sal altyd verseker dat die korrekte/toepaslike
formule gebruik word en dat bewerkings, insluitende substitusies korrek is.
1.11 Questions where a series of calculations have to be made (e.g. a circuit
diagram question) do not necessarily always have to follow the same order.
FULL MARKS will be awarded provided it is a valid solution to the problem.
However, any calculation that will not bring the candidate closer to the answer
than the original data, will not count any marks.
Vrae waar ʼn reeks berekeninge gedoen moet word (bv. ʼn stroombaan-
diagramvraag) hoef nie noodwendig dieselfde volgorde te hê nie. VOLPUNTE
sal toegeken word op voorwaarde dat dit ʼn geldige oplossing vir die probleem
is. Enige berekening wat egter nie die kandidaat nader aan die antwoord as
die oorspronklike data bring nie, sal geen punte tel nie.
2. UNITS/EENHEDE
2.1 Candidates will only be penalised once for the repeated use of an incorrect unit
within a question.
Kandidate sal slegs een keer gepenaliseer word vir die herhaaldelike gebruik
van ʼn verkeerde eenheid in ʼn vraag.
2.2 Units are only required in the final answer to a calculation.
Eenhede word slegs in die finale antwoord op ʼn vraag verlang.
2.3 Marks are only awarded for an answer, and not for a unit per se. Candidates
will therefore forfeit the mark allocated for the answer in each of the following
situations:
• Correct answer + wrong unit
• Wrong answer + correct unit
• Correct answer + no unit
Punte sal slegs vir ʼn antwoord en nie vir ʼn eenheid per se toegeken word nie.
Kandidate sal die punt vir die antwoord in die volgende gevalle verbeur:
• Korrekte antwoord + verkeerde eenheid
• Verkeerde antwoord + korrekte eenheid
• Korrekte antwoord + geen eenheid
2.4 SI units must be used except in certain cases, e.g. V .m-1 instead of N.C-1, and
cm•s-1 or km•h-1 instead of m•s-1 where the question warrants this.
SI-eenhede moet gebruik word, behalwe in sekere gevalle, bv. V•m-1 in plaas
van N•C-1, en cm•s-1 of km•h-1 in plaas van m•s-1 waar die vraag dit regverdig.
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4 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2023)
3. GENERAL/ALGEMEEN
3.1 If one answer or calculation is required, but two are given by the candidate, only
the first one will be marked, irrespective of which one is correct. If two answers
are required, only the first two will be marked, etc.
Indien een antwoord of berekening verlang word, maar twee word deur die
kandidaat gegee, sal slegs die eerste een nagesien word, ongeag watter een
korrek is. Indien twee antwoorde verlang word, sal slegs die eerste twee
nagesien word, ens.
3.2 For marking purposes, alternative symbols (s, u, t, etc.) will also be accepted.
Vir nasiendoeleindes sal alternatiewe simbole (s, u, t, ens.) ook aanvaar word.
3.3 Separate compound units with a multiplication dot, not a full stop, for example,
m•s-1.
For marking purposes, m•s-1 and m/s will also be accepted.
Skei saamgestelde eenhede met ʼn vermenigvuldigingspunt en nie met ʼn punt
nie, byvoorbeeld m•s-1. Vir nasiendoeleindes sal m•s-1 en m/s ook aanvaar word.
4. POSITIVE MARKING/POSITIEWE NASIEN
Positive marking regarding calculations will be followed in the following cases:
Positiewe nasien met betrekking tot berekeninge sal in die volgende gevalle geld:
4.1 Subquestion to subquestion: When a certain variable is calculated in one
subquestion (e.g. 3.1) and needs to be substituted in another (3.2 of 3.3), e.g. if
the answer for 3.1 is incorrect and is substituted correctly in 3.2 or 3.3, full marks
are to be awarded for the subsequent subquestions.
Subvraag na subvraag: Wanneer ʼn sekere veranderlike in een subvraag (bv.
3.1) bereken word en dan in ʼn ander vervang moet word (3.2 of 3.3), bv. indien
die antwoord vir 3.1 verkeerd is en word korrek in 3.2 of 3.3 vervang, word
volpunte vir die daaropvolgende subvraag toegeken.
4.2 A multistep question in a subquestion: If the candidate has to calculate, for
example, current in die first step and gets it wrong due to a substitution error, the
mark for the substitution and the final answer will be forfeited.
ʼn Vraag met veelvuldige stappe in ʼn subvraag: Indien ʼn kandidaat bv. die
stroom verkeerd bereken in ʼn eerste stap as gevolg van ʼn substitusiefout,
verloor die kandidaat die punt vir die substitusie sowel as die finale antwoord.
5. NEGATIVE MARKING/NEGATIEWE NASIEN
Normally an incorrect answer cannot be correctly motivated if based on a conceptual
mistake. If the candidate is therefore required to motivate in QUESTION 3.2 the
answer given in QUESTION 3.1, and QUESTION 3.1 is incorrect, no marks can be
awarded for QUESTION 3.2. However, if the answer for e.g. QUESTION 3.1 is
based on a calculation, the motivation for the incorrect answer could be considered.
ʼn Verkeerde antwoord, indien dit op ʼn konsepsuele fout gebaseer is, kan normaalweg
nie korrek gemotiveer word nie. Indien ʼn kandidaat gevra word om in VRAAG 3.2 die
antwoord op VRAAG 3.1 te motiveer en VRAAG 3.1 is verkeerd, kan geen punte vir
VRAAG 3.2 toegeken word nie. Indien die antwoord op bv. VRAAG 3.1 egter op ʼn
berekening gebaseer is, kan die motivering vir die verkeerde antwoord in VRAAG 3.2
oorweeg word.
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(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 5
QUESTION 1/VRAAG 1: MULTIPLE-CHOICE QUESTIONS
MEERVOUDIGEKEUSE-VRAE
1.1 D (2)
1.2 C (2)
1.3 B (2)
1.4 C (2)
1.5 C (2)
1.6 A (2)
1.7 C (2)
1.8 D (2)
1.9 A (2)
1.10 C (2)
[20]
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6 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2023)
QUESTION 2/VRAAG 2
2.1 Newton’s third law
Newton se derde wet (1)
2.2
Notes
Mark awarded for arrow and label.
Do not penalise for length of arrows since drawing is not drawn to scale,
Any other additional force(s). Max. 4⁄5
If force(s) do not make contact with body. Max. 4⁄5
Aantekeninge
Punt word toegeken vir byskrif en pyltjie.
Moenie vir die lengte van die pyltjie penaliseer nie
Enige addisionele krag(te). Maks. 4⁄5
As krag(te) nie kontak maak met liggaam nie. Maks. 4⁄5 (5)
2.3.1 Fnet = ma Any one / Enige een
F – T – f = ma
9 000 – T – 3 500 = 0
T = 5 500 N (3)
POSITIVE MARKING FROM / POSITIEWE NASIEN VANAF 2.3.1
2.3.2 Fnet = ma
T – f = ma Any one / Enige een
T – µkN = ma
T – µkmg = ma
5 500 – µk x 950 x 9,8 = 0
∴µk = 0,59 (0,591) (4)
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(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 7
2.4 Fnet = ma
-f = ma Any one / Enige een
-(µkN) = ma
-(µkmg) = ma
-(0,59 x 950 x 9,8) = 950a
∴a = -5,78 m.s-2
∴a = 5,78 m.s-2 (to the right / na regs) (3)
[16]
QUESTION 3/VRAAG 4
3.1 9,8 m.s-2 (1)
3.2.1 UPWARD POSITIVE/OPWAARTS AS UPWARD NEGATIVE/OPWAARTS AS
POSITIEF NEGATIEF
Δy = viΔt + ½ aΔt 2 Δy = viΔt + ½ aΔt2
2
-2 = vi x 0,125 + ½ x (-9,8)(0,125) 2 = vi x 0,125 + ½ (9,8)(0,125) Any one/
-1 Any one/ -1 Enige een
vi = -15,388 m.s Enige een vi = 15,388 m.s
2 2
vf = vi + 2aΔy 2 2
vf = vi + 2aΔy
2 2
-15,388 = 0 + 2(-9,8) Δy 15,3882 = 02 + 2(9,8) Δy
∴Δy = 12,08 m ∴Δy = 12,08 m
Height / Hoogte = 12,08 + 2 Height / Hoogte = 12,08 + 2
Height / Hoogte = 14,08 m Height / Hoogte = 14,08 m (5)
3.2.2 UPWARD POSITIVE/OPWAARTS AS UPWARD NEGATIVE/OPWAARTS AS
POSITIEF NEGATIEF
vf = vi + aΔt vf = vi + aΔt
-15,388 = 0 + (-9,8)(Δt) 15,388 = 0 + (9,8)(Δt)
∴Δt = 1,57 s ∴Δt = 1,57 s
Δt = 1,57 + 0,125 Δt = 1,57 + 0,125
Δt = 1,70 s Δt = 1,70 s (4)
OPTION 1/OPSIE 1
3.2.3 UPWARD POSITIVE/OPWAARTS AS UPWARD NEGATIVE/OPWAARTS AS
POSITIEF NEGATIEF
2 2
vf = vi + 2aΔy vf2 = vi2 + 2aΔy
2 2
vf = -15,388 + 2(-9,8)(-2) vf2 = 15,3882 + 2(9,8)(2)
∴vf = 16,61 m.s-1 downwards / afwaarts ∴vf = 16,61 m.s-1 downwards/afwaarts
OPTION 2/OPSIE 2
UPWARD POSITIVE/OPWAARTS AS UPWARD NEGATIVE/OPWAARTS AS
POSITIEF NEGATIEF
vf = vi + aΔt vf = vi + aΔt
vf = -15,388 + (-9,8)(0,125) vf = 15,388 + (9,8)(0,125)
vf = - 16,61 ∴vf = 16,61 m.s-1 downwards/afwaarts
-1
∴vf = 16,61 m.s downwards / afwaarts
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8 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2023)
OPTION 3/OPSIE 3
UPWARD POSITIVE/OPWAARTS AS UPWARD NEGATIVE/OPWAARTS AS
POSITIEF NEGATIEF
v + vi v + vi
Δx = f Δt Δx = f Δt
2 2
v + (−15,388) v + 15,388
-2 = ( f ) x 0,125 2= ( f ) x 0,125
2 2
∴vf = 16,61 m.s-1 downwards /afwaarts ∴vf = 16,61 m.s-1 downwards /afwaarts (3)
UPWARD POSITIVE/OPWAARTS AS UPWARD NEGATIVE/OPWAARTS AS
POSITIEF NEGATIEF
CRITERIA FOR MARKING / NASIENKRITERIA
Correct shape / Korrekte vorm
Initial position indicated / Aanvanklike posisie aangedui
Time when ball hits the ground / Tyd wanneer bal die grond tref (3)
[16]
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(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 9
QUESTION 4/VRAAG 4
4.1 A system on which the net external force is zero.
ʼn Sisteem waar die netto eksterne krag nul is. (2)
4.2 ∑pi = ∑pf
Any one / Enige een
mAvi + mBvi = mAvf + mBvf
(mA + mB)vi = mAvf + mBvf
(2 + 1) x 0 = 1 x 5 + 2vf
vf = 2,5 m.s-1 left / links (west / wes) (4)
OPTION 1 / OPSIE 1 OPTION 2 / OPSIE 2
4.3 Fnet∆t = ∆p Fnet = ma
Fnet∆t = m∆v Any one / Enige een -80 = 1 x a
Fnet∆t = mvf – mvi a = -80 m.s-2
-80 x 0,05 = 1 x vf – 1 x 5 vf = vi + a∆t
vf = 1 m.s-1 left / links (west / wes) vf = 5 + (-80) x 0,05
vf = 1 m.s-1 left / links (west / wes) (4)
4.4 Collision in which kinetic energy is not conserved.
Collision where total kinetic energy before the collision is not equal to the total
kinetic energy after the collision.
Botsing waarin die kinetiese energie nie behoue is nie.
Botsing waar die totale kinetiese energie voor die botsing nie gelyk is aan die
totale kinetiese energie na die botsing nie. (2)
[12]
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10 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2023)
QUESTION 5/VRAAG 5
5.1 The work done on an object by a net force is equal to the change in kinetic
energy of the object.
Die arbeid verrig op ʼn voorwerp deur ʼn netto krag is gelyk aan die
verandering in die voorwerp se kinetiese energie. (2)
OPTION 1 / OPSIE 1
5.2 Wnet = ∆Ek
WFg + Wf = ∆Ek
-∆Ep + Wf = ∆Ek Any one / Enige een
[-mg(h2 – h1)] + f.∆xcos θ = ½mvf2 - ½ mvi2
- 50 x 9,8 (0 – 5) + 72∆xcos180o = ½ x 50 x 82 – 0
∆x = 11,81 m
5
θ = sin-1( )
11,81
θ = 25,05°
OPTION 2 / OPSIE 2
Wnc = ∆Ep + ∆Ek
Wnc = [mg(h2 – h1)] + ½mvf2 – ½mvi2 Any one / Enige een
Wf = [mg(h2 – h1)] + ½ mvf2 – ½ mvi2
72∆xcos180° = 50 x 9,8 (0 – 5) + ½ x 50 x 82 – 0
∆x = 11,81 m
5
θ = sin-1
11,81
θ = 25,05°
OPTION 3 / OPSIE 3
Wnet = ∆Ek Any one / Enige een
2 2
(Fg - Ff).Δx.cos θ = ½ mvf – ½ mvi
(mg sin θ – 72).Δx.(1) = ½ (50)(82 – 02)
50(9,8)(5) x
– 72Δx = 1 600
x
Δx = 11,81 m
5
θ = sin-1
11,81
θ = 25,05° (6)
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(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 11
5.3
(3)
5.4 OPTION 1 / OPSIE 1
Wnet = ∆Ek
Wf = ∆Ek Any one / Enige een
Wf = ½mvf2 – ½mvi2
Wf = 0 – ½ x 50 x 82
Wf = 1 600 J
OPTION 2 / OPSIE 2
Wnc = ∆Ep + ∆Ek
Any one / Enige een
Wf = ∆Ep + ∆Ek
Wf= 0 – ½ x 50 x 82
Wf = 1 600 J
OPTION 3 / OPSIE 3
vf2 = vf2 + 2aΔx
02 = 82 + 2a(10)
∴ a = -3,2 m·s-1
Fnett = ma (Any ONE / Enige EEN )
= 50 x (-3,2)
= -160 N (= Ff)
Wf = Ff . Δx . cos θ
= (160)(10)(cos 180°)
= 1 600 J (4)
[15]
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12 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2023)
QUESTION 6/VRAAG 6
6.1 The (apparent) change in frequency observed by a listener because the
listener and source of sound have different velocities relative to the medium
of sound propagation.
Die verandering in frekwensie van die klank waargeneem deur ʼn luisteraar
omdat die klankbron en luisteraar verskillende snelhede relatief tot die
medium waarin die klank voortgeplant word, het.
The (apparent) change in frequency observed by a listener due to relative
motion between the sound source and the listener.
Die verandering in die (waargenome) frekwensie waargeneem deur ʼn
luisteraar omdat daar relatiewe beweging is tussen die luisteraar en die
klankbron. (2)
6.2 Towards observer B. Frequency detected by observer B is higher than the
frequency detected by observer A.
Na waarnemer B. Die frekwensie wat waargeneem word deur luisteraar B
is hoër as die waargenome frekwensie deur luisteraar A. (2)
6.3 v ± vL
fL = fs
v ± vs
343
545 = x fs ……….(1)
343 + vs
343
615 = x fs ……….(2)
343 – vs
vs = 20,70 m.s-1 (20,69827586 m.s-1)
545(343 + 27,70) 615(343 – 27,70)
fs = OR/OF fs =
343 343
fs = 577,91 Hz (range / gebied 577,89 Hz to 577,91 Hz) (7)
6.4 The star is moving away.
The spectral lines show a decrease in frequency (towards red).
OR/OF
The spectral lines show an increase in wavelength (towards red).
Die ster beweeg weg.
Die spektralelyne toon ʼn afname in frekwensie (na rooi).
OR/OF
Die spektralelyne toon ʼn toename in golflengte (na rooi). (2)
[13]
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(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 13
QUESTION 7/VRAAG 7
7.1 The electrostatic force exerted by one point charge on another is directly
proportional to the product of the charges and inversely proportional to the
square of the distance between them.
Die elektrostatiese krag wat een puntlading op ʼn ander puntlading uitoefen
is direk eweredig aan die produk van die groottes van die ladings en
omgekeerd eweredig aan die kwadraat van die afstand tussen hulle. (2)
7.2
Marking criteria / Nasienkriteria
Direction / Rigting
Straight lines / Reguitlyne
Touching and vertically from charge./
Raak en is loodreg vanaf die lading
(3)
7.3 kQ1Q2
F=
r2
F = (9 x 109)(36 x 10-6)(16 x 10-6)
(0,03)2
F = 5 760 N (3)
7.4 Negative. For the test charge to experience a net force of zero, the electric
field due to P and T should be in opposite (directions). The electric field of
P is to the right, for the electric field of T to move to the left, (away) from point
X, it must be a negative charge.
Negatief. Vir die puntlading om ʼn netto krag van nul te ervaar moet die
elektrieseveld a.g.v. P en T in teenoorgestelde (rigtings) wees. Die
elektrieseveld van P is regs sodat die elektrieseveld van T na links beweeg
(weg) vanaf punt X. so dit moet ʼn negatiewe lading wees. (3)
7.5 kQ
E=
r2
E1 = (9 x 109)(36 x 10-6) right / regs (Note distance to be correct / Let wel
(0,03 + r)2 die afstand moet korrek wees)
(Any 1 of Top substitutions / Enige van die
vervangings)
E2 = (9 x 109)(16 x 10-6) left/links
r2
Enet = E1 + E2
0 = (9 x 109)(36 x 10-6) + (-(0,03 + r)2) (Correct addition / Korrekte
(0,03 + r)2 r2 addisie)
r = 0,06 m (5)
[16]
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14 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2023)
QUESTION 8/VRAAG 8
8.1 The total energy per coulomb of charge that a battery can supply.
Die totale energie per coulomb lading wat ʼn battery kan verskaf. (2)
8.2.1 P = I2 R
16 = 22 x R
R=4Ω (3)
8.2.2 Positive marking from / Positiewe nasien vanaf 8.2.1
OPTION 1 / OPSIE 1 OPTION 2 / OPSIE 2
V 12
R= I10 = x 2
I 10
V I 10 = 2,4 A
12 = p I = I10 + I2
2 I = 2,4 + 2
V = 24 V I = 4,4 A
24
I10 =
10
I10 = 2,4 A
I = I10 + I2
I = 2,4 + 2
I = 4,4 A (5)
8.2.3 Positive marking from 8.2.1 and 8.2.2. / Positiewe nasien vanaf 8.2.1
en 8.2.2
1 1 1 R1 R2
= + Rp =
Rp R1 R2 R1 + R2
1 1 1
= + 10 x 12
Rp 10 12
Rp =
10 + 12
Rp = 5,4545 Ω
Rp = 5,4545 Ω
Rext = 7,4545 Ω
Emf / Emk= I(Rext + r)
[36 = 4,4 (7,4545 + r)]
R = 0,73 Ω (6)
8.3 Decrease. The total external resistance will increase, and the current will
decrease.
Afneem. Die totale eksterne weerstand sal toeneem en die stroom sal
afneem. (2)
[18]
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(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 15
QUESTION 9/VRAAG 9
9.1 Mechanical energy to electrical energy.
Meganiese energie na elektriese energie. (2)
9.2
EMF/EMK (V)
t (s)
Marking criteria / Nasienkriteria
Correct shape/ Korrekte vorm
Two complete waves / Twee volledige golwe (2)
9.3 AC can be transmitted over long-distances because it causes minor energy
loss.
OR/OF
The potential difference can be increased or decreased.
WS kan oor lang afstande met minimale energie verlies oorgedra word.
OR/OF
Die potensiaalverskil can verhoog of verlaag word. (1)
9.4 Vrms/ wgk OR Root mean square voltage/wortel gemiddelde kwadraat
spanning (1)
9.5.1 I
I rms = max
2
6,25
Irms =
√2
Irms = 4,42 A (3)
9.5.2 Positive marking from / Positiewe nasien vanaf 9.3.1
OPTION 1 / OPSIE 1
2
Paverage / gemiddeld = 𝐼𝑟𝑚𝑠 R
= 4,422 x 45
= 879,14 W (3)
[12]
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16 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2023)
QUESTION 10/VRAAG 10
10.1 The process whereby electrons are ejected from a (metal) surface, when
light of suitable frequency is incident on that surface.
Die proses waardeur elektrone uit ʼn (metaal)oppervlakte vrygestel word,
wanneer lig van geskikte frekwensie invallend op die oppervlak is. (2)
10.2 Increasing the power rating of the light bulb increases the intensity of the
photons. Increase in intensity does not affect the maximum kinetic
energy or maximum speed of the photo-electrons.
Toename in die drywinggradering van die gloeilampies verhoog die
intensiteit van die fotone. Toename in die intensiteit affekteer nie die
maksimum kinetiese energie nie of maksimum spoed van die
fotoëlektrone nie. (2)
10.3 Light B. It has the higher intensity. More photo-electrons will be ejected
and therefore more current. (Ammeter reading will be higher.)
Lig B. Dit het ʼn hoër intensiteit. Meer foto-elektrone word vrygestel en
daarom meer stroom. (Ammeterlesing sal hoër wees). (2)
10.4.1 OPTION 1 / OPSIE 1 OPTION 2 / OPSIE 2
E = hc c = f𝜆
𝜆 3x10 8
f=
6,63x10 -34 x3x10 8 490x10 - 9
E=
490x10 - 9 f = 6,12244898 Hz
E = 4,06 x 10-19 J E = hf
E = 6,63 x 10-34 x 6,12244898 x 1014
E = 4,06 x 10-19 J (3)
10.4.2 Positive marking from / Positiewe nasien vanaf 10.4.1.
E = W0 + Ek(max/ maks.)
4,06 x 10-19 = Wo + ½ x 9,11 x 10-31 x (7,5 x 105)2
W0 = 1,50 x 10-19 J (4)
[13]
TOTAL / TOTAAL: 150
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