Hey there! Sign in to join this conversationNew here? Join for free
    Offline

    1
    ReputationRep:
    (Original post by habeeb_00)
    I'd say it depends on if they're feeling generous. The thermometer isn't really less reliable than the data logger, it's just less precise in its measurements.

    Posted from TSR Mobile
    Hmm okay it was 2 marks right? For the second you could have less margin for human/reading errors
    Offline

    11
    ReputationRep:
    (Original post by Arisole)
    Hmm okay it was 2 marks right? For the second you could have less margin for human/reading errors
    Yeah that's fine, any reference to being easier to read will probs be given
    Offline

    11
    ReputationRep:
    (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

    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 .

    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.(1)
    The last question was why the temperature of the liquid decreases when it evaporates (3 marks)


    Posted from TSR Mobile
    Offline

    1
    ReputationRep:
    For the similar properties of infrared and microwave I put the both can be absorbed and the both can diffract. Would I get these marks?!
    Offline

    1
    ReputationRep:
    Thickness of the mug for the mug question
    Offline

    10
    ReputationRep:
    (Original post by Cakes717)
    For the similar properties of infrared and microwave I put the both can be absorbed and the both can diffract. Would I get these marks?!
    yes that is correct
    Offline

    2
    ReputationRep:
    (Original post by jackbarry1999)
    can someone help me i put 4200 divided by 100 x 0.5 and i got 21 i then took 21 away from the initial temp of 100 but it got me 79 where did i go wrong
    You needed to put the specific heat capacity in the equation, you put the initial temperature in instead (100) which isn't right because you are working out the temperature , but 78 was the final answer so you were close


    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    [QUOTE=Imas1501;65163015]You needed to put the specific heat capacity in the equation, you put the initial temperature in instead (100) which isn't right because you are working out the temperature , but 78 was the final answer so you were close


    how many marks could i of got
    Offline

    1
    ReputationRep:
    (Original post by ihatehannah)
    yes that is correct
    So both can be absorbed is right then?😅
    Offline

    2
    ReputationRep:
    (Original post by Zhundo)
    Thickness of the mug for the mug question
    I don't think that's right, the answers were surface area and colour


    Posted from TSR Mobile
    Offline

    11
    ReputationRep:
    (Original post by lilacpotato)
    The last question was why the temperature of the liquid decreases when it evaporates (3 marks)


    Posted from TSR Mobile
    Oh yeah:

    The temperature decreases because the particles near the surface get energy from other particles in the liquid (???) so lower the average particle energy of the liquid as they evaporate, which corresponds to an overall temperature decrease. Bit rough.
    Offline

    10
    ReputationRep:
    (Original post by Cakes717)
    So both can be absorbed is right then?😅
    yup
    Offline

    2
    ReputationRep:
    For the why it wouldn't be economically worthwhile to connect the mountain area to the grid I said that "too much energy will be lost through the cables which would have to be long to reach the mountain area?"


    Posted from TSR Mobile
    Offline

    1
    ReputationRep:
    What was the answer to the question when the student repeated the same experiment but with less volume of water? (1 mark)
    Offline

    2
    ReputationRep:
    [QUOTE=jackbarry1999;65163099]
    (Original post by Imas1501)
    You needed to put the specific heat capacity in the equation, you put the initial temperature in instead (100) which isn't right because you are working out the temperature , but 78 was the final answer so you were close


    how many marks could i of got
    Possibly 2 out of 3 because you did try to use the equation and minus the answer from the initial temperature


    Posted from TSR Mobile
    Offline

    10
    ReputationRep:
    (Original post by Imas1501)
    I don't think that's right, the answers were surface area and colour


    Posted from TSR Mobile
    I do not think colour is one.
    Offline

    3
    ReputationRep:
    (Original post by Yusuf90)
    What was the answer to the question when the student repeated the same experiment but with less volume of water? (1 mark)
    Less water = quicker evaporation, thus quicker rate of decreased temp.
    Offline

    2
    ReputationRep:
    (Original post by Yusuf90)
    What was the answer to the question when the student repeated the same experiment but with less volume of water? (1 mark)
    Slower rate of evaporation, because the rate of evaporation decreases when reducing the surface area because less particles are exposed


    Posted from TSR Mobile
    Offline

    1
    ReputationRep:
    (Original post by Imas1501)
    I don't think that's right, the answers were surface area and colour


    Posted from TSR Mobile
    The heat would conduct into the mug then into the coffee so the thinner the mug the less distance the energy has to travel.
    Offline

    3
    ReputationRep:
    (Original post by Imas1501)
    Slower rate of evaporation


    Posted from TSR Mobile
    Damn... just realized this now. what a fool.
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.