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    Any idea for grade boundaries yet guys? Regarding guesses!
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    (Original post by Habina786xx)
    Sameee I put that!!!

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    I don't think so...
    They are 2 different waves on the EM spectrum...
    You should have said stuff like travelling through a vacuum and same speeds, etc
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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.

    16) why a vacuum reduces energy transfer (2) : no particles so stops energy transfer by conduction , convection and radiation
    Hi would I get marks for saying electromagnetic radiation instead of CMBR. Also, would I get marks for saying nature of the surface of the mug for the energy transfer question, and would I get marks for saying windflow for the control variable for the evaporation question
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    (Original post by Alfieee)
    What was the question where the answer was 340m/s?
    work out the speed of the wave with frequency of 20 khz ish and wavelength of about 0.0381m or something like that.
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    (Original post by Mahrez)
    For a disadvantage of nuclear doesn't it have a long start up time?
    I said that too


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    I did that but you should still get 2/3 for all the working 😭
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    (Original post by ihatehannah)
    work out the speed of the wave with frequency of 20 khz ish and wavelength of about 0.0381m or something like that.
    Oh yeah I remember! Thank you
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    (Original post by Mahrez)
    For a disadvantage of nuclear doesn't it have a long start up time?
    I put that as well and i said it produces radioactive waste but im not sure if they'll accept the first one.
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    I think the grade boundaries will be:
    50 A*
    40 A
    29 B
    19 C
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    could you have room temperature for the control variable?

    a response would be much appreciated :-)
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    (Original post by ma77tyLG9)
    could you have room temperature for the control variable?

    a response would be much appreciated :-)
    I believe the question did say other than volume or temperature.
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    (Original post by oliviasanders1)
    I think you're meant to take it away from 100 to get 78
    your are, don't worry 78 is right because it said 'heat transferred from liquid to ...... where ever it was, and then asked about it the liquids temp. so don't worry u are right
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    What do you guys think the Grade Boundaries will be?
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    (Original post by Mahrez)
    I think the grade boundaries will be:
    50 A*
    40 A
    29 B
    19 C
    personally I do not think it will ever be 50 , I think between 46-48 for a*
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    For the question on the first 100 seconds, I think I got something like 0.064 due to how in interpreted the graph... Will this be ok?
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    (Original post by Mahrez)
    I think the grade boundaries will be:
    50 A*
    40 A
    29 B
    19 C
    meh it think more likely to be 47/48 A*
    and then 38/39 A
    and then 28 B
    etc
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    (Original post by ihatehannah)
    personally I do not think it will ever be 50 , I think between 46-48 for a*
    Last year was 50 and i felt the difficulty was the same?
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    (Original post by Mahrez)
    Last year was 50 and i felt the difficulty was the same?
    last year was 47 for a*, not 50.
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    (Original post by PrinceKian)
    Hi would I get marks for saying electromagnetic radiation instead of CMBR. Also, would I get marks for saying nature of the surface of the mug for the energy transfer question, and would I get marks for saying windflow for the control variable for the evaporation question
    I think there was a question where it asked about temp decrease, and i think you had to find out the gradient, so you drew a triangle on the graph and it was like -9/100 and i think (probably wrong) but answer was 0.09 decrease per second
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    Can someone please answer my above Q's, it would be very much appreciated
 
 
 
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