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# Edexcel IGCSE Physics Paper 2 Unofficial Mark Scheme

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1. Please comment answers (and question numbers/marks for the question if you remember)

this is just what I remember and I'm probably wrong so pls correct me

1. a. Alpha (1)
b. Alpha (1)
c. 50cm (1)
d. Atomic number increases by 1 (1)
e. Light (1)

2. a. Arrow going from north to south on two different field lines (2)
b. Arrow pointing from the wire to the left (2)
c. Straight and regularly spaced lines between the magnets (uniform field) and arrows going from north to south (2)

Definition of pitch:
The frequency of a wave, the higher the frequency the higher the pitch (2)

Equipment for experiment:
Ruler/tape measure (1)
Oscilloscope (1)

Independent variable: length of pipe (1)
Dependent variable: frequency (1)

To improve the experiment (3):
1. Do repeats and calculate an average
2. Avoid parallax error
3. Avoid zero error

Static electricity:
a. Friction causes electrons to be transferred which have a negative charge (2)
b. i. charge = current x time (1)
ii. 0.002 A (2)
c. The guy still gets a shock because he is electrically charged and the button is made out of metal, which is a conductor, so the electrons are attracted to the charge which causes a shock (3)

Compass experiment:
Place a bar magnet on a piece of paper and a plotting compass at one pole, mark with a dot where the arrow points to, move the compass to that point, and carry on until the compass is at the other pole. Join up all the dots with a curved line and repeat this with different starting points for the compass. (3)

Digital signal:
a. It's digital because there are only two values on the graph, 0 and 9 (1)
b. You can increase the amount of information being sent by quantisation and increasing bandwith (2)

Energy question:
a. work = force x distance
5460 joules (2)
b. 5460 joules (1) (has to be the same answer as what you got for a)

Momentum:
a. momentum = mass x velocity (1)
b. 1.55 kgm/s (2)
c. 22.1 N (3)
d. There was an equal and opposite force - make reference to either Newton's third law or the principle of conservation of momentum (2)
e. Pressure = force/area
The force is the same but the area in contact with the wood is smaller than the area in contact with the hammer, making the pressure larger (2)

Moments:
a. the X should be above where the weight acts, roughly centre (1)
b. moment = force x perpendicular distance (1)
c. 201N or 202N (4)

Convection current:
Air is heated, particles gain kinetic energy and become further apart, it's less dense than the surrounding air so it rises, cooler air from outside moves in to replace it (4)

Evaporation:
Kinetic energy is not evenly distributed throughout the water, the particles with the most kinetic energy will evaporate first, this reduces the overall kinetic energy of the water and kinetic energy is directly proportional to kelvin temperature (3)
2. awesome thanks
3. Hi, thanks so much for this.
I think 1d) is atomic number increases by one because a proton and a neutron are the same mass
4. Tools for Experiment were : Oscilloscope and ruler
Reason why there is a shock was because the person is charged and the metal(very conductive) contains electrons which are attracted to that charge causing a shock
Question after the calculations for momentum you had to talk about Newtons third law or conservation of momentum
Had to draw a uniform magnetic field with equal parallel lines and arrows for the drawing
Moments answer for the 4 marker was 202 N
5. (Original post by Handwritingman)
Tools for Experiment were : Oscilloscope and ruler
Reason why there is a shock was because the person is charged and the metal(very conductive) contains electrons which are attracted to that charge causing a shock
Question after the calculations for momentum you had to talk about Newtons third law or conservation of momentum
Had to draw a uniform magnetic field with equal parallel lines and arrows for the drawing
Moments answer for the 4 marker was 202 N
I got 201 for the moment?
6. I dont remember exactly but it was around that and a decimal
7. (Original post by Handwritingman)
I dont remember exactly but it was around that and a decimal
yeah and I think the charge equation is wrong as 0.2 miili amps is 0.0002 amps?
8. Charge was 0.002 amps ( you had to divide 25 ms by 1000 to get seconds)
9. Didn't the wire move to the left? The current went into the page, the field lines were from top to bottom and you use Fleming's left hand rule for motor effect?
10. (Original post by Handwritingman)
Charge was 0.002 amps ( you had to divide 25 ms by 1000 to get seconds)
Also,
To improve experiment you could also mention some means of getting the volume of air being blown in as constant- such as a vacuum or something else
11. (Original post by akaash13)
Didn't the wire move to the left? The current went into the page, the field lines were from top to bottom and you use Fleming's left hand rule for motor effect?
Yep force was arrow to the left
12. q1 is 50 meters

Posted from TSR Mobile
13. (Original post by defenestrated)
Please comment answers (and question numbers/marks for the question if you remember)

this is just what I remember and I'm probably wrong so pls correct me

1. a. Alpha (1)
b. Alpha (1)
c. 50cm (1)
d. Atomic number increases by 1 (1)
e. Light (1)

2. a. Arrow going from north to south on two different field lines (2)
b. Arrow pointing from the wire to the right (2)

Equipment for experiment:
Ruler/tape measure (1)
Oscilloscope (1)

To improve the experiment (3):
1. Do repeats and calculate an average
2. Avoid parallax error
3. Avoid zero error

Static electricity:
a. Friction causes electrons to be transferred which have a negative charge (2)
b. i. charge = current x time (1)
ii. 2.2 x10-8 A (2)
c. The guy still gets a shock because he is electrically charged and the button is made out of metal, which is a conductor, so the electrons are attracted to the charge which causes a shock (3)

Compass experiment:
Place a bar magnet on a piece of paper and a plotting compass at one pole, mark with a dot where the arrow points to, move the compass to that point, and carry on until the compass is at the other pole. Join up all the dots with a curved line and repeat this with different starting points for the compass. (3)

Digital signal:
a. It's digital because there are only two values on the graph, 0 and 9 (1)
b. You can increase the amount of information being sent by quantisation and increasing bandwith (2)

Energy question:
a. work = force x distance
5460 joules (2)
b. 5460 joules (1) (has to be the same answer as what you got for a)

Momentum:
a. momentum = mass x velocity (1)
b. 1.55 kgm/s (2)
c. There was an equal and opposite force - make reference to either Newton's third law or the principle of conservation of momentum (2)
d. Pressure = force/area
The force is the same but the area in contact with the wood is smaller than the area in contact with the hammer, making the pressure larger (2)

Moments:
a. the X should be above where the weight acts, roughly centre (1)
b. 201N or 202N (4)

Convection current:
Air is heated, particles gain kinetic energy and become further apart, it's less dense than the surrounding air so it rises, cooler air from outside moves in to replace it (4)

Evaporation:
Kinetic energy is not evenly distributed throughout the water, the particles with the most kinetic energy will evaporate first, this reduces the overall kinetic energy of the water and kinetic energy is directly proportional to kelvin temperature (3)
It's 50 m not 50cm
14. (Original post by akaash13)
Didn't the wire move to the left? The current went into the page, the field lines were from top to bottom and you use Fleming's left hand rule for motor effect?
I did it to the left as well but a few people have said it's to the right
so
i don't know
15. Yeah it was to the left!
16. (Original post by Handwritingman)
Yep force was arrow to the left
It's Flemings RIGHT hand rule not left..
17. (Original post by Handwritingman)
Charge was 0.002 amps ( you had to divide 25 ms by 1000 to get seconds)
Yep!! ^
18. and force went from right to left because of the left hand rule

Posted from TSR Mobile
19. (Original post by Handwritingman)
Also,
To improve experiment you could also mention some means of getting the volume of air being blown in as constant- such as a vacuum or something else
thought the time was 75 milli seconds and the charge was 0.0017 coulombs
20. (Original post by Lauren9699)
It's Flemings RIGHT hand rule not left..
No it is left hand rule. Right hand grip rule is for current carrying wire.

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