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    Hello everyone! Lets get to work on making a mark scheme, if you could post your questions and answers below that be great!
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    (Original post by oddle)
    Hello everyone! Lets get to work on making a mark scheme, if you could post your questions and answers below that be great!
    Completed mark scheme, hope it's clear and a good indication of what you got in the exam, good luck!
    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. Risk of nuclear disasters.

    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) avoids human error (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.

    16) why a vacuum reduces energy transfer (2) : no particles so stops energy transfer by conduction , convection.
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    (Original post by ihatehannah)
    1. Frequency

    2. Echoes

    3. spread out, same as

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

    5. inefficient as less or little energy used to heat food as heat is lost as infrared radiation to the surroundings

    calculation questions, 340 m/s for first one, then 78 degrees , then 6.4 watts then 0.07 degrees/s
    for the rural one could i have put that it would be expensive connecting to the national grid so the amount of electricity generated wouldn't be worth it?
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    (Original post by B3ASTy)
    for the rural one could i have put that it would be expensive connecting to the national grid so the amount of electricity generated wouldn't be worth it?
    I wrote somthing along those lines too
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    The efficiency calculation answer was 0.48W
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    (Original post by charliej2802)
    The efficiency calculation answer was 0.48W
    Yeah I put that
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    Did anyone else put 22 degrees, think i messed it up
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    (Original post by charliej2802)
    The efficiency calculation answer was 0.48W
    I got that too
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    (Original post by charliej2802)
    Did anyone else put 22 degrees, think i messed it up
    I put that aswell i think its wrong
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    (Original post by charliej2802)
    Did anyone else put 22 degrees, think i messed it up
    I added it to the 100 to get 122
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    (Original post by charliej2802)
    Did anyone else put 22 degrees, think i messed it up
    You'll probably get a mark or two for that, you only missed out one step.
    Posted from TSR Mobile
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    No, basically the temperature change was 22 and 100 - 22 = 78 which is the final temp
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    (Original post by charliej2802)
    Did anyone else put 22 degrees, think i messed it up
    You forgot to subtract that from 100, so 100 - 22 = 78*C
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    The reason why it's not 22 is because 22 was the temperature change meaning you had to take it away 100 which gives you 78
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    (Original post by trishka)
    I added it to the 100 to get 122
    I think you're meant to take it away from 100 to get 78
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    I think it is 78 as 22 was the temperature change so you minus it by 100 to get the final temperature which is 78
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    The correct answer was 78 degrees i think, which is 100-22
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    (Original post by trishka)
    I got that too
    Wasnt the answer that x100 because there was x100 at the end of the equation?
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    (Original post by charliej2802)
    Did anyone else put 22 degrees, think i messed it up
    I think you'll still get 2 marks out of the 3
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    (Original post by trishka)
    I added it to the 100 to get 122
    I did that too - I'm sure we'll still get a minimum of 1 mark


    Posted from TSR Mobile
 
 
 
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