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AQA Physics P1 Unofficial Markscheme 2016 watch

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    1. Frequency ( 1)
    2. Echoes (1)
    3. spread out, same as or equal to (2)
    b) The vibrations are parallel to the direction of energy transfer (2)
    4. Expensive as long wires are needed to go around the mountains to reach the home (1)

    4b) ADVANTAGES
    constant supply, little variation in output
    £30k cheaper than wind turbine
    renewable resource
    doesn't produce as much noise as wind
    No CO2

    DISADVANTAGES
    could ruin ecosystem by preventing free movement of fish
    May need maintenance unlike wind
    Lower power output - 8W compared to 10W

    Wind - ADVANTAGES
    higher average output
    Needs little maintenance
    renewable resource
    Easily expanded
    No CO2

    DISADVANTAGES
    Eyesore
    noise pollution
    Wind speeds vary, meaning there could be times of under- or oversupply
    Costs 50k, 30k more than HEP (6)

    5. Inefficient as less or little energy used to heat food as heat is lost as infrared radiation to the surroundings.(2)

    b) Uses of microwaves and infrared for communication2)
    Microwave- phone/ satellite communication (1)
    Infrared- Remote controls?? (?), Optical fibres?


    Propeties of electromagnetic waves:
    - diffract(1)
    -Refract(1)
    - Diffract(1)
    - Travel in a vacuum (1)
    - Reflected(1)

    calculation questions,
    -340 m/s (2)
    -78 degrees(3)
    -6.4 watts(2) then
    -Question on the first 100 seconds? 0.07 (2)
    - efficiency question 0.48 W (2)


    6. Fins increase surface area (1) and black are excellent absorbers of heat (1)
    7. cosmic microwave background radiation (1)
    b) provides evidence for the big bang theory (1)
    or the universe expanding

    10. The lower the cost, the more efficient it is because:
    - Huge difference between e.g panel C and panel A only for an extra 10% efficiency (1)
    - (Numerical evidence) 8 Panel Cs will total up to £44 with 80% efficiency (1)

    11. why france will still use nuclear power(2) :
    - cost of electricity is cheaper with Nuclear than with renewable sources
    - produces much more electricity than it actually needs using nuclear power
    - produces no greenhouse gases like co2

    12. Disadvantages of nuclear power stations(2):
    -raw materials are non- renewable
    - high decommissioning costs
    -produces radioactive waste, (hard to store.)

    13. factors that affect rate of energy transfer of mug(2):
    -room temperature so larger difference in temperature of mug and surroundings
    -surface area of mug

    b) How does energy pass from the mug base?
    -Conduction, particles gain kinetic energy and collide more frequently,
    -passing on their extra kinetic energy to other particles .(2)

    c) how is a convection current formed in the mug(4):
    -liquid at the bottom is heated and particles gain kinetic energy
    -and move away from each other, this makes the liquid less dense
    - causing it to rise
    -and displace the denser colder air at the top , the denser particles then fall
    -heated again (creating a circulation with is convection currents)

    14) control variable for the investigation measuring rate of evaporation (1) :
    -same beaker
    -same type of beaker
    -same position in the room
    - same thermometer
    - To tear the data logger to zero for all three

    b) why is the data logger better: (2)
    - more accurate, as it's sensitive
    - easier to read
    - Not prone to human error so it's reliable.

    Extra bits

    Why does evaporation cool down liquid (2?)
    - Energetic particles leave
    - Lower average particle energy

    What would happen if volume of liquid decreases, what affect would it have. (1)
    -Less volume= less evaporation???
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    You know the question about the properties of microwave and infrared. Is there any chance of getting a mark for saying

    Same wavelength

    Same frequency

    Idk why I put that when I new the other answer 😒

    Thanks
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    (Original post by Hahahqjaj)
    You know the question about the properties of microwave and infrared. Is there any chance of getting a mark for saying

    Same wavelength

    Same frequency

    Idk why I put that when I new the other answer 😒

    Thanks
    Not sure i'm a afriad because microwaves have higher wavelengths than infrared and microwaves have lower frequencies than infrared too sorry
    But i lost loads of marks throughout the paper too a lot of us did, don't worry!
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    Do you think I could have said that microwaves and infrared waves both have low frequency and long wavelength?


    Posted from TSR Mobile
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    For the mug question you could put the colour of the mug (black) or the thickness of the mug.
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    could you have said for the properties of microwaves and infrared that they both travel at the same speed and they are both transverse waves?
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    What was the question where the answer was 340m/s ?
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    (Original post by Alfieee)
    What was the question where the answer was 340m/s ?
    I think it was the one about the bats ?
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    (Original post by _mk)
    I think it was the one about the bats ?
    it was that one where you had to use the equation
    v = f × λ
    So you had something hertz
    You had the wavelength
    and you had to times them
    it was 340m/s
    am i talking about the right one lol?
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    (Original post by shrey_15)
    could you have said for the properties of microwaves and infrared that they both travel at the same speed and they are both transverse waves?
    High chance you'd get one for "transverse waves"
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    (Original post by CaSama9)
    it was that one where you had to use the equation
    v = f × λ
    So you had something hertz
    You had the wavelength
    and you had to times them
    it was 340m/s
    am i talking about the right one lol?
    Yeah that's the one
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    (Original post by CaSama9)
    it was that one where you had to use the equation
    v = f × λ
    So you had something hertz
    You had the wavelength
    and you had to times them
    it was 340m/s
    am i talking about the right one lol?
    i remember the numbers 25Khz and 0.0316m ... somtehing like that..
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    (Original post by shrey_15)
    could you have said for the properties of microwaves and infrared that they both travel at the same speed and they are both transverse waves?
    could you also have said the waves transfer energy?
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    (Original post by _mk)
    i remember the numbers 25Khz and 0.0316m ... somtehing like that..
    Oh yes and we then converted KHZ into hertz so 25,000hz * times the metres
    I don't think the numbers are exactly correct :P
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    How did people find the exam?
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    could you write the shape of the mug as the answer for the mug question? i wrote colour first but then changed it to shape..
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    (Original post by okey)
    How did people find the exam?
    prepared myself for the higher paper, last minute i find out im doing foundation.. so pissedd but it was SO easy
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    I put volume does not affect rate of evaporation,not sure if this is right though
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    I put 122 degrees instead of 78 degrees because I added the 22 to the 100 instead of subtracting it? How many working marks would I get out of 3?
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    What was question 4? I can't seem to remember?
 
 
 
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