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    For why France uses nuclear, I wrote that because they make more than they use, they can sell the amount of energy that they don't use. Therefore, the can make money.
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    For edexcel: http://www.thestudentroom.co.uk/show...5#post65163325
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    (Original post by redsoules)
    Sorry. It asked for TEMPERATURE CHANGE not the actual temp. It was 22oC

    Well ****. This is what I thought It asked anyway? It gave SHC, what we needed to find out what the temperature difference. and the difference was 22. From my calculations anyway??
    No it asked for temperature not temperature change
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    But didn't you have to minus 22 again? I thought the answer was for only 1 hour so you had to minus it again.........or am I being stupid?
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    (Original post by caseyforbes11)
    I'm scared now haha, I wrote 78 degrees as I thought you did 100-22 which gives you 78 degrees
    Yes that is right
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    (Original post by SugarBubbles2000)
    Temperature after 2 hours was 78 degrees Celsius
    But didn't you have to minus the 22 again? I thought the answer from the equation gave you the difference after 1 hour so wouldn't you minus 22 again to get it after 2 hours?.......or have I been stupid?
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    (Original post by redsoules)
    Sorry. It asked for TEMPERATURE CHANGE not the actual temp. It was 22oC

    Well ****. This is what I thought It asked anyway? It gave SHC, what we needed to find out what the temperature difference. and the difference was 22. From my calculations anyway??
    Yep I got 22 Degrees too 🙂
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    (Original post by 11alexandru-kore)
    For the speed I got 0.34m/s because the formula is speed(m/s)=frequency(Hz)x wavelength(m)
    so its 0.0136m X 25Hz=0.34m/s?
    340m/s... the frequency was given in kHz so you had to x1000 to get it in Hz
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    (Original post by Resty)
    340m/s... the frequency was given in kHz so you had to x1000 to get it in Hz
    Yh I got that aswell cuz the frequency was kHz
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    (Original post by dangerouswoman)
    I put 22 degrees celsius as well. So was it 22 or 78?!
    I got 22
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    (Original post by x_rizma_x)
    I got 22
    Question asked for the final temperature of the beaker after 2 hours so I'm afraid you had to subtract 22 from 100 to get the final temperature.
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    (Original post by Rhian2k)
    But didn't you have to minus the 22 again? I thought the answer from the equation gave you the difference after 1 hour so wouldn't you minus 22 again to get it after 2 hours?.......or have I been stupid?
    The equation was not about time at all, I think time came into the next one to do with power.

    This was just the specific heat capacity for the whole transfer. If that makes sense
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    Anyone else pleased with themselves after seeing this mark scheme?
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    (Original post by b.wldn)
    Anyone else pleased with themselves after seeing this mark scheme?
    I'm happy with a lot of it a few silly marks
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    For the volume question surely the surface area is not affected by the volume if they are using the same equipment, therefore decreasing volume will have no effect on the rate of evaporation?
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    For nuclear power plant disadvantages could you have they produce nuclear waste and acid rain and they cost a lot to build and to hire workers ? Only two I could think of 😂
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    (Original post by Ollie1999)
    Some hard some easy let's get a mark scheme compiled

    1. Frequency determines pitch (1)

    2. Echo (1)

    3. The sound waves bends (1)

    4. Waves length larger/equal to than the bat (1)

    5. Longitudinal wave: Vibrates/oscillations parallel (90°) to the energy transfer (2)

    6. Communications of:
    1. Infra red - remote controls (1)
    2. Microwaves - mobile phones/satellite (1)

    7. Both microwaves and infrared radiation: (2)
    1. Transverse waves
    2. Travel at the speed of light in a vacuum

    8. CMBR (1)

    9. Provides evidence for the big bang theory (1)

    10. It's not economical because: (2)
    1. Small village (very few people)/remote location so connecting to the national grid is not economically viable/profitable
    2. Micro generation has a higher efficiency of generation
    3. They live on mountains so cables would need to travel very far to connect to them (lots of energy loss)

    11. Wind turbines vs Hydroelectric generator: (6)
    1. Wind more expensive (£50,000) than hydroelectric (£20,000)
    2. Wind generated the most (10 KW) than hydroelectric (8KW)
    3. Hydroelectric provides constant energy so more reliable whereas wind varies so not as reliable.
    4. Hydroelectric generators ruin the habitat.
    5. Wind turbines visual pollution/eye sore.

    12. The heat escapes into the surrounding so not all the heat is received by the food/very little useful energy. (2)

    13. Fins - increased surface area so more particles are exposed to to heat (1)

    14. Black metal - absorbs infra red radiation so heats better/metal is a good conductor of heat (1)

    15. As you increase the temperature, the rate of which it emits infra-red radiation will increase (because of a bigger temperature increase) (2)

    16. Vacuum in kettle prevents heat loss through conduction and convection (2)

    17. Temp. change = 46,200 / 0.5x4,200 = 22, New temp. = 100-22 = 78° (3)

    18. Useful energy = 0.15 x 3.2 = 0.48KJ (2)

    19. P = E/t = 46,200 / 2 x 60 x 60 = 6.4 W (2)

    20. France would continue using nuclear power because: (2)
    1. It's the cheapest the generate
    2. It provides the largest amount of energy (and extra could he sold for profits)

    21. Disadvantages of nuclear stations: (2)
    1. Radioactive waste
    2. Expensive to decommission
    3. Very dangerous, if explosions occur, people could die/get serious illnesses

    22. When the efficiency increases by just 5%, it costs an extra £17.50 to manufacture, which is expensive and eventually not be economically viable/profitable. (2)
    (The same comment can be made about the £40 per square meter one with only 10% increase and 8x more expensive)

    23. Control Variable: (1)
    1. The volume of the containers are the same
    2. Airflow in the room
    3. Temperature of the surroundings
    4. Anything else about the beaker being the same ie width thickness material
    24. Data logger vs Thermometer: (2)
    1. Higher resolution (decimal points) (Aka more accurate)
    2. Displays the numbers so more precise as it reduces estimation from reading the thermometer
    3. Creates a graph
    4. Updates quicker

    25. 20-13.25 / 100 = 0.0675 °/s (2)

    26. They all decreased at a decreasing rate (1)

    27. A because it decreased in temperature the least (2)

    28. Decreasing the volume increases the surface area so more evaporation meaning it will lose temperature quicker. (1)

    29. Particles in the water with the highest kinetic energy are able to break the intermolecular forces between the particles/escape the liquid thus reducing the overall kinetic energy of the water. This causes it to cool down. (3)

    30. Factors of heat transfer to coffee: (2)
    1. The amount of energy the heater receives
    2. The temperature of the room

    31. The heater heats the bottom of the glass, making the particles vibrate/gain kinetic energy, which pass on to the neighbouring particles until the whole bottom of the glass is heated. (3)


    32. Particles near the heater gain kinetic energy so they become less dense and rise. They displace the cooler, more dense particles which then sink. These then gain kinetic energy, decrease density and rise and this continues as convection currents. (4)uction , convection.
    Hey can you do one for aqa as new spec 24th may physics paper 1 plz
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    WAS IT A, B or C
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    (Original post by Jfm9898)
    Hey can you do one for aqa as new spec 24th may physics paper 1 plz
    I don't do AS sorry lmao
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    (Original post by Azarhuntttt)
    For nuclear power plant disadvantages could you have they produce nuclear waste and acid rain and they cost a lot to build and to hire workers ? Only two I could think of 😂
    Yeah that would work
    (Original post by GeorgeMillerr)
    WAS IT A, B or C
    Was what A B or C?
 
 
 
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