Physics P2 Unofficial Markscheme Edexcel. watch
Last edited by TSRPAV; 17-06-2016 at 16:28.
- 17-06-2016 16:22
- 17-06-2016 16:54
For the question about how hospital staff take precautions i put standing behind a glass window. Will i still get mark?
- 17-06-2016 17:17
- 17-06-2016 17:21
Q1. Static Electricity
a. What is the diagram pointing to? (1)
Answer - Proton.
b. Why does the girl get positively charged as she walks across the nylon carpet? (3)
Answer - The insulating soles of the girl’s shoes rub against the nylon carpet (1)
Electrons are transferred (1)
From the girl to the carpet (1)
c. Why does she get a small electric shock when she touches the metal handle of the door? (2)
Answer - Metal is a conductor (1)
Charge flows (from girl) to the conductor (1)
For an easy route to the ground (1)
d. Math question.
Answer - 6.3C (0.07A * 90)
Q2. Nuclear Fission & Fusion.
a. What is the difference between a fission and fusion reaction?
b. Fill in the blanks (number of protons and neutrons)
Protons - 92
Neutrons - 143
d. Graph question about correlating temperature and fusion reactions per second.
Fusion needs a high temperature to overcome repulsion between positive nuclei. The graph shows a correlation between the increase in rate of fusion reaction per second and temperature - as temperature increases, so does rate of reaction. (thank you to L0st45!)
Q3. Half Life (I think)
a. Half life of Iodine-131.
Answer- 8 days.
b. Estimate half life of Iodine-131 8 days ago.
c. Why do hospital staff have increased risks from handling Iodine-131?
Answer- Beta and gamma are ionising radiation (1)
If they enter the body, they could collide with (molecules of) genetic material / DNA (1)
This could cause cell mutations (1)
Which may lead to tissue damage / cancer (1)
d. Name some precautions taken to prevent being affected by Iodine-131.
Answer- Tongs/Special Suits.
e. What emitter is used for paper rollers?
Answer - Beta emitter.
f. How does this system work?
The beta roller passes through the paper and the detector keeps a track on how many beta particles pass through. If the paper is too thick, beta count drops and the detector sends a signal to reduce pressure on the paper. If the paper is too thin, beta count is too high and the detector sends a signal to increase pressure on the paper.
Q4. Rollercoaster Question
a. 2.37 million/1.71 million
b. 1.71 million.
c. Energy transfer when the rollercoaster moves from C to D.
GPE to Kinetic Energy, as it loses its GPE as it moves downward and according to conservation of energy, it changes to kinetic energy.
Q5. Volts Question
a. Draw the voltmeter.
b. 12 Volts can be written as :
Answer - 12 Joules per coulomb.
c. Prove that the resistance is 11 ohms.
Answer- The resistance was 10.8 ohms, which is about 11 ohms
e. Six marker on filament lamp.
a. Acceleration of the graph.
Answer : y/x to get gradient = 6 m/s^2
b. Draw the graph for a cyclist with a smaller acceleration.
c. Why does the cyclist need to keep pedaling?
Answer- To overcome air resistance and maintain the same velocity.
- 17-06-2016 17:23
The answer is D for the Ammeter and Voltmeter question. Ammeter = increase, Voltmeter = decrease.
- 17-06-2016 17:30
- 17-06-2016 17:32
- 17-06-2016 17:34
I didn't say it heats up because of electrons colliding with the ions in the lattice but I did everything else! How many marks do you think I will get? 4-5 / 6?
Posted from TSR Mobile
- 17-06-2016 17:36
- 17-06-2016 17:44
It couldn't have been that because the decay is exponential so it wouldn't be a linear decrease so you can't just add 80. I thought that because it had a half life of 8 days, to estimate 7 days before you'd just multiply 180 by 2 to get 360?
- 17-06-2016 17:44
kinda sucks when you give a few answers and they get used in the markscheme but there is no rep / quote / mention of it.....
- 17-06-2016 17:58
For the transfer of energy question about the rollercoaster from C to D, wasn't it the other way around. KPE --> GPE + thermal and sound ??
- 17-06-2016 18:00
And for the safety precaution, I said a lead screen to absorb the radiation. Will I get the mark?
Last edited by Tsr74; 17-06-2016 at 18:16.
- 17-06-2016 18:14
- 17-06-2016 18:23
Yayyy based on this mark scheme only lost 2 marks (not including the estimation one).
For the estimation one, I put 260 but then thought it was too small and then put 300 lol.
Posted from TSR Mobile
(Original post by Penguin_S)
- 17-06-2016 18:26
I thought that the answer would be d at first but if resistance increases the the current will decrease which will lead to the voltage to decrease because current and voltage are directly proportionalLast edited by Tsr74; 17-06-2016 at 18:28.
Last edited by TSRPAV; 17-06-2016 at 18:54.
- 17-06-2016 18:38
- 17-06-2016 18:43
- 17-06-2016 18:45
(Original post by TSRPAV)
- 17-06-2016 18:54
Did it say that anything was kept constant or anything except the resistance changed? cos current is inversely proportional to resistance so as the resistance rises the current decreases assuming voltage stays the same