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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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    For the national grid question, I wrote 'energy will be lost as heat when traveling through cables'
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    (Original post by ihatehannah)
    1. Frequency ( 1)

    2. Echoes (1)

    3. spread out, same as (2)

    b) vibrations are parallel to the direction of energy transfer (2)

    4. Expensive as National Grid is a long distance away from rural areas (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)

    uses of infrared(1) : remote controls, optical fibres

    uses of microwaves(1): mobile phones, satellites

    b) properties of microwaves and infra red radiation (2): can diffract, can refract, travel same speed in vaccuum, both transverse waves, can be reflected transverse• same speed (through air)• can be reflected• can be refracted• can be diffracted• can be absorbed• transfer energy• can travel through a vacuum• can be polarised• show interference

    calculation questions, 340 m/s for first one (2) then 78 degrees(3) , then 6.4 watts(2) then 0.07 degrees/s (2) efficiency question was 0.48 W (2)


    6. Fins increase surface area and black matt a are good absorbers of heat (2)

    7. cosmic microwave background radiation (1)

    b) provides evidence for the big bang theory (1)


    10. They keep costs as low as possible as efficiency does not increase as much but the cost goes up rapidly , ( give example and data figures to secure the marks) (2)


    11. why france will still use nuclear power(2) : cost of electricity is cheaper(1) and produces much more electricity(1) , produces no greenhouse gases like co2(1)

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

    13. factors that affect rate of energy transfer of mug(2): room temperature, surface area , how shiny it is( not sure about this one) and colour of the mug

    b) 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 liquid at the top , the denser particles then fall and is heated again.


    14) control variable for the investigation measuring rate of evaporation (1) : same beaker or same type of beaker, same position in the room., same thermometer .

    b) why is the data logger better(2): more accurate (1) , easier to read(1) , more precise (1)

    15 relationship of the graph comparing 3 types of beakers and their rate of evaporation(1): as time increases, rate of evaporation decreases.

    b) Beaker A(1) gradient of the line is the lowest and the final temperature is the highest of em all

    c) If investigation was repeated with lower volume , what effect would it have(1) : rate of evaporation will be higher (1)

    Why evaporation causes temperature to decrease (3): particles with enough kinetic energy and travelling in the right direction will escape the liquid and evaporate and take their kinetic energy with them , which means average kinetic energy of particles in liquid is lower and thus temperature is lower.
    For 5b (probably not but) would there be any chance of getting a mark for saying Same wavelength Same frequency ..I have no idea why I put that when I clearly new the right answer 😭
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    (Original post by ihatehannah)
    1. Frequency ( 1)

    2. Echoes (1)

    3. spread out, same as (2)

    b) vibrations are parallel to the direction of energy transfer (2)

    4. Expensive as National Grid is a long distance away from rural areas, cables are expensive to install (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
    Methane is produced from rotting vegetation

    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, lost as light and sound(2)

    uses of infrared(1) : remote controls, optical fibres

    uses of microwaves(1): mobile phones, satellites

    b) properties of microwaves and infra red radiation (2): can diffract, can refract, travel same speed in vaccuum, both transverse waves, can be reflected transverse• same speed (through air)• can be reflected• can be refracted• can be diffracted• can be absorbed• transfer energy• can travel through a vacuum• can be polarised• show interference

    calculation questions, 340 m/s for first one (2) then 78 degrees(3) , then 6.4 watts(2) then 0.07 degrees/s (2) efficiency question was 0.48 W (2)


    6. Fins increase surface area and black matt a are good absorbers of heat (2)

    7. cosmic microwave background radiation (1)

    b) provides evidence for the big bang theory (1)


    10. They keep costs as low as possible as efficiency does not increase as much but the cost goes up rapidly , ( give example and data figures to secure the marks) (2)


    11. why france will still use nuclear power(2) : cost of electricity is cheaper(1) and produces much more electricity(1) , produces no greenhouse gases like co2(1)

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

    13. factors that affect rate of energy transfer of mug(2): room temperature, surface area , how shiny it is( not sure about this one) and colour of the mug, amount in contact with coffee, amount of energy transferred, temperature difference between two

    b) 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 liquid at the top , the denser particles then fall and is heated again.


    14) control variable for the investigation measuring rate of evaporation (1) : same beaker or same type of beaker, same position in the room., same thermometer .

    b) why is the data logger better(2): more accurate (1) , easier to read(1) , more precise (1)

    15 relationship of the graph comparing 3 types of beakers and their rate of evaporation(1): as time increases, rate of evaporation decreases.

    b) Beaker A(1) gradient of the line is the lowest and the final temperature is the highest of em all

    c) If investigation was repeated with lower volume , what effect would it have(1) : rate of evaporation will be higher (1)

    Why evaporation causes temperature to decrease (3): particles with enough kinetic energy and travelling in the right direction will escape the liquid and evaporate and take their kinetic energy with them , which means average kinetic energy of particles in liquid is lower and thus temperature is lower.
    I made some changes ^
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    What did you guys get for the decreasing of the volume of the liquid and what happens to the rate of evaporation? Also what was the graph showing (all of them)? And what about the liquid that had the SLOWEST rate of evaporation (I got A)
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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
    I don't think so because microwaves have a longer wavelength therefore lower frequency. The answers were they can reflect/refract/diffract or both transverse or both travel at speed of light


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    (Original post by Hahahqjaj)
    For 5b (probably not but) would there be any chance of getting a mark for saying Same wavelength Same frequency ..I have no idea why I put that when I clearly new the right answer 😭
    no sorry.
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    (Original post by dhruvap)
    What did you guys get for the decreasing of the volume of the liquid and what happens to the rate of evaporation? Also what was the graph showing (all of them)? And what about the liquid that had the SLOWEST rate of evaporation (I got A)
    Slower the rate of evaporation, because the rate of evaporation decreases when reducing the surface area because less particles are exposed.

    And A was correct


    Posted from TSR Mobile
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    AQA GCSE Physics unit 1 Unofficial mark scheme
    Please add it to your list
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    Surely the question about microwaves was actually electromagnetic radiation?
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    And could I have put same windflow for the evaporation control variable question?
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    (Original post by ihatehannah)
    1. Frequency ( 1)

    2. Echoes (1)

    3. spread out, same as (2)

    b) vibrations are parallel to the direction of energy transfer (2)

    4. Expensive as National Grid is a long distance away from rural areas (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)

    uses of infrared(1) : remote controls, optical fibres

    uses of microwaves(1): mobile phones, satellites

    b) properties of microwaves and infra red radiation (2): can diffract, can refract, travel same speed in vaccuum, both transverse waves, can be reflected transverse• same speed (through air)• can be reflected• can be refracted• can be diffracted• can be absorbed• transfer energy• can travel through a vacuum• can be polarised• show interference

    calculation questions, 340 m/s for first one (2) then 78 degrees(3) , then 6.4 watts(2) then 0.07 degrees/s (2) efficiency question was 0.48 W (2)


    6. Fins increase surface area and black matt a are good absorbers of heat (2)

    7. cosmic microwave background radiation (1)

    b) provides evidence for the big bang theory (1)


    10. They keep costs as low as possible as efficiency does not increase as much but the cost goes up rapidly , ( give example and data figures to secure the marks) (2)


    11. why france will still use nuclear power(2) : cost of electricity is cheaper(1) and produces much more electricity(1) , produces no greenhouse gases like co2(1)

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

    13. factors that affect rate of energy transfer of mug(2): room temperature, surface area , how shiny it is( not sure about this one) and colour of the mug

    b) 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 liquid at the top , the denser particles then fall and is heated again.


    14) control variable for the investigation measuring rate of evaporation (1) : same beaker or same type of beaker, same position in the room., same thermometer .

    b) why is the data logger better(2): more accurate (1) , easier to read(1) , more precise (1)

    15 relationship of the graph comparing 3 types of beakers and their rate of evaporation(1): as time increases, rate of evaporation decreases.

    b) Beaker A(1) gradient of the line is the lowest and the final temperature is the highest of em all

    c) If investigation was repeated with lower volume , what effect would it have(1) : rate of evaporation will be higher (1)

    Why evaporation causes temperature to decrease (3): particles with enough kinetic energy and travelling in the right direction will escape the liquid and evaporate and take their kinetic energy with them , which means average kinetic energy of particles in liquid is lower and thus temperature is lower.
    I think you missed out the question about how a vacuum for the kettle reduces the rate of energy transfer? Do you know how many marks that was?
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    Also, for the tea question, could I have mentioned that the nature of the surface of the mug would affect the energy transfer? Thanks
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    2 marks I think it was
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    What did people get for that question where it was something like 42600 joules, and 2 hours. What was the power output or something??

    Thanks
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    For the diffraction sentence near the front of the paper, instead of spread out, i put bending, is that right or wrong?
    • TSR Community Team
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    TSR Community Team
    (Original post by rayestar)
    AQA GCSE Physics unit 1 Unofficial mark scheme
    Please add it to your list
    It's there :yay:
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    (Original post by Billybob17283)
    i did the same...dont see why they wouldnt give the mark because in the question they asked for the microwaves found.
    Yeah that's exactly what i was thinking..
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    (Original post by LaliG)
    What did people get for that question where it was something like 42600 joules, and 2 hours. What was the power output or something??

    Thanks
    I think it was 6.4W
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    (Original post by Yusuf90)
    I think you missed out the question about how a vacuum for the kettle reduces the rate of energy transfer? Do you know how many marks that was?
    added it in , and yes it was 2 marks.
 
 
 
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