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    (Original post by Mahrez)
    particles gain kinetic energy become less dense rise and escape etc
    Nope - the 3rd mark would be that the overall temperature would decrease too
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    (Original post by Dizgurl)
    Evaporation:


    Why do you hear a delay between the sound produced and the reflected sound?
    i don't know how to answer that very well could you give a sample answer please!
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    (Original post by Dizgurl)
    Evaporation:
    Low Density
    Temperature of liquid is higher
    Airflow is greater
    Larger surface area

    Condensation:
    Temperature is lower
    Temperature of the surface which the gas touches is lower
    Concentration is higher

    Why do you hear a delay between the sound produced and the reflected sound?
    The reflected sound has to travel further to reach your ears than the original sound meaning it takes longer to reach you and therefore a delay.
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    (Original post by hafsa473)
    Nope - the 3rd mark would be that the overall temperature would decrease too
    thats stupid because thats esentially the cooling effect
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    (Original post by CaSama9)
    i don't know how to answer that very well could you give a sample answer please!
    Sure

    You hear a delay between the original sound and the reflected sound because the reflected sound has to travel further, taking loner to reach your ears. It is called an echo
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    (Original post by Jobayori)
    The reflected sound has to travel further to reach your ears than the original sound meaning it takes longer to reach you and therefore a delay.
    Well done
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    (Original post by hafsa473)
    Nope - the 3rd mark would be that the overall temperature would decrease too
    Ok lol,

    cooling effect is when the
    1. Most energetic particles escape the surface of a liquid via evaporation
    2. Resulting in lower Average Particle Energy
    3. So less movement, fewer collision, so fewer transfer of energy (heat)
    4. = a drop in the overall temperature

    Explain why Metals conduct better than non-metals? [probably 4 or 5 marks]
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    What is rarefaction and compression in a sound wave?
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    (Original post by Dizgurl)
    Evaporation:


    Why do you hear a delay between the sound produced and the reflected sound?
    Because the sound wave has to travel in order to be reflected off the medium, causing an echo.

    Q: give an advantage and a disadvantage of Tidal Barrages
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    (Original post by CaSama9)
    Ok lol,

    cooling effect is when the
    1. Most energetic particles escape the surface of a liquid via evaporation
    2. Resulting in lower Average Particle Energy
    3. So less movement, fewer collision, so fewer transfer of energy (heat)
    4. = a drop in the overall temperature

    Explain why Metals conduct better than non-metals? [probably 4 or 5 marks]
    Metals contain free electrons
    These free electrons gain kinetic energy and collide with each other passing on even more kinetic energy
    The particles in the metal also gain kinetic energy
    They vibrate passing even more kinetic energy
    in reference to an insulator the partoicles vibrate in the insulator slower through the structure than that of a metal
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    (Original post by Mahrez)
    thats stupid because thats esentially the cooling effect
    You need to also state the obvious to get the mark
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    (Original post by Mahrez)
    What is rarefaction and compression in a sound wave?
    Rarefaction is where the wavelengths are more spread out, and compression is where they are closer together.

    (Am I right by saying it is the wavelengths that are spread out?)


    Q: in a longitudinal wave, which direction are the vibrations, to the direction of energy transfer in the wave?
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    (Original post by jazz_xox_)
    Because the sound wave has to travel in order to be reflected off the medium, causing an echo.

    Q: give an advantage and a disadvantage of Tidal Barrages
    Advantage:
    Does not cause any atmospheric pollution
    Renewable
    Minimal Running costs

    Disadvantages:
    Altering the habitats of wild animals that live nearby
    Initial costs are fairly high

    What is the difference between accurate and precise?
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    (Original post by jazz_xox_)
    Because the sound wave has to travel in order to be reflected off the medium, causing an echo.

    Q: give an advantage and a disadvantage of Tidal Barrages
    Advantage Tides are reliable they come in twice a day, can store energy
    Disadvantage: Expenisve to build a barrage
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    (Original post by jazz_xox_)
    Because the sound wave has to travel in order to be reflected off the medium, causing an echo.

    Q: give an advantage and a disadvantage of Tidal Barrages
    Advantage-
    it's renewable
    fairly reliable as theres at least 2 tides in a day
    no production of greenhouse gases polluting the atmosphere
    no running costs
    store energy

    Disadvantage-
    tide height may be low and may not produce a lot of electricity
    start up cost is high?
    disrupt the enviroment?
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    (Original post by jazz_xox_)
    Rarefaction is where the wavelengths are more spread out, and compression is where they are closer together.

    (Am I right by saying it is the wavelengths that are spread out?)


    Q: in a longitudinal wave, which direction are the vibrations, to the direction of energy transfer in the wave?
    The directions of energy transfer are parrallel to the oscillations
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    (Original post by CaSama9)
    Advantage-
    it's renewable
    fairly reliable as theres at least 2 tides in a day
    no production of greenhouse gases polluting the atmosphere
    no running costs
    store energy

    Disadvantage-
    tide height may be low and may not produce a lot of electricity
    start up cost is high?
    disrupt the enviroment?
    You're so clever! Is this at the top of your head?
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    (Original post by CaSama9)
    Advantage-
    it's renewable
    fairly reliable as theres at least 2 tides in a day
    no production of greenhouse gases polluting the atmosphere
    no running costs
    store energy

    Disadvantage-
    tide height may be low and may not produce a lot of electricity
    start up cost is high?
    disrupt the enviroment?
    The tide is 'pretty reliable and always near to the predicted height' - quoted from the revision guide, so your first disadvantage is wrong
    Otherwise, all correct
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    (Original post by jazz_xox_)
    Rarefaction is where the wavelengths are more spread out, and compression is where they are closer together.

    (Am I right by saying it is the wavelengths that are spread out?)


    Q: in a longitudinal wave, which direction are the vibrations, to the direction of energy transfer in the wave?
    The direction of the vibrations are parallel to the direction of energy transfer in the wave.

    What is payback time?
    Calculate the payback time of an insulating jacket that costs £250, but you save yearly £100.
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    (Original post by jazz_xox_)
    Rarefaction is where the wavelengths are more spread out, and compression is where they are closer together.

    (Am I right by saying it is the wavelengths that are spread out?)


    Q: in a longitudinal wave, which direction are the vibrations, to the direction of energy transfer in the wave?
    In longitudunal waves, the vibrations of the wave are travelling parralel to the direction of energy transfer.

    T transverse
    W waves
    A are
    T technically

    P Perpendicular to the
    D direction of
    E energy
    T transfer

    Advantages and disadvantages of over head and underground cables?

 
 
 
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