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    Conduction question: free electrons at bottom of pan get energy from flame then collide with the electrons around it due to increased kinetic energy, transferring the energy on, etc. this heats up the food and pan slowly

    Convection question: coffee at bottom of mug heated, gets less dense than that above it and rises to top. Coffee now at bottom of mug also gets heated and rises, and cooler coffee above it sinks to bottom for heating, etc. This cycle repeats over and over, forming a convection current. Maybe marks for mentioning how the coffee at the top cools slowly by losing heat to surroundings.
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    Soo confused. Was it 340m/s for the speed of sound???


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    (Original post by snapchatter)
    Soo confused. Was it 340m/s for the speed of sound???


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    Yes.

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    The national grid question is wrong.

    The answer is:
    It would cost more to connect the rural area 's electricity production to the national grid then the value of the electricity produced. So they are not connected as it's not economically viable.
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    (Original post by Arisole)
    I think it was average P = E/t = 46,200kWh/2h = 23,100W
    i got the same answer but u know the unit was in W, however the time was in hours.. so i guess we had to convert it.. but it was just a 2 marker so idkk
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    (Original post by ihatehannah)
    1. Frequency

    2. Echoes

    3. spread out, same as

    b) vibrations are parallel to the direction of energy transfer

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

    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

    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 efficiency question was 0.48 W


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

    7. cosmic microwave background radiation

    b) provides evidence for the big bang theory


    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)


    11. why france will still use nuclear power , 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: raw materials are non- renewable, high decommissioning costs, produces radioactive waste.
    What was the question with the bit in bold? Was it the graph?
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    (Original post by ihatehannah)
    1. Frequency

    2. Echoes

    3. spread out, same as

    b) vibrations are parallel to the direction of energy transfer

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

    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

    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 efficiency question was 0.48 W


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

    7. cosmic microwave background radiation

    b) provides evidence for the big bang theory


    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)


    11. why france will still use nuclear power , 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: raw materials are non- renewable, high decommissioning costs, produces radioactive waste.

    13. factors that affect rate of energy transfer of mug: room temperature, surface area .

    b) particles gain kinetic energy and collide more frequently, passing on their extra kinetic energy to other particles .
    12. Can you say an explosion at a nuclear power plant is very dangerous?
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    (Original post by ihatehannah)
    1. Frequency

    2. Echoes

    3. spread out, same as

    b) vibrations are parallel to the direction of energy transfer

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

    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

    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 efficiency question was 0.48 W


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

    7. cosmic microwave background radiation

    b) provides evidence for the big bang theory


    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)


    11. why france will still use nuclear power , 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: raw materials are non- renewable, high decommissioning costs, produces radioactive waste.

    13. factors that affect rate of energy transfer of mug: room temperature, surface area .

    b) particles gain kinetic energy and collide more frequently, passing on their extra kinetic energy to other particles .
    If I said Cosmic Background Radiation would I still get the mark?
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    (Original post by trishka)
    I added it to the 100 to get 122
    Same i didnt realise temperature was decreasing, i thought it was increasing
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    (Original post by Adamtoo)
    If I said Cosmic Background Radiation would I still get the mark?
    probably not.
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    can we post the number of marks nxt too the answers plz
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    (Original post by Adamtoo)
    If I said Cosmic Background Radiation would I still get the mark?
    No. The full 1 mark will be given only if you wrote Cosmic Microwave Background Radiation.
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    (Original post by Tinka99)
    They both travel at the speed of light
    They both can travel through a vacuum


    i've put they can be refracted and reflected.. would that count?
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    (Original post by Ads.m)
    12. Can you say an explosion at a nuclear power plant is very dangerous?
    I do not think so, sorry.
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    (Original post by coreHelp)
    i've put they can be refracted and reflected.. would that count?
    That was allowed in the June 2012 paper so I don't see why not.

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    (Original post by coreHelp)
    i've put they can be refracted and reflected.. would that count?
    definitely allowed
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    For the question about rate of energy transfer to the mug I put it depends on power output of the heater. Is that wrong?
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    ihatehannah Try and tidy up the answers. I would have created one but now that you've done it...
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    (Original post by Adamtoo)
    If I said Cosmic Background Radiation would I still get the mark?
    for questiion 13, would surface area and volume count as 2 marks?
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    Can you please put the amount of marks beside each question and for the calculations too? Thanks
 
 
 
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