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# AQA GCSE PHYSICS UNIT 1 Question Game!

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1. (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
2. (Original post by Dizgurl)
Evaporation:

Why do you hear a delay between the sound produced and the reflected sound?
3. (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.
4. (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
5. (Original post by CaSama9)
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
6. (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
7. (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]
8. What is rarefaction and compression in a sound wave?
9. (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.

10. (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
11. (Original post by Mahrez)
thats stupid because thats esentially the cooling effect
You need to also state the obvious to get the mark
12. (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?
13. (Original post by jazz_xox_)
Because the sound wave has to travel in order to be reflected off the medium, causing an echo.

Does not cause any atmospheric pollution
Renewable
Minimal Running costs

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

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

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

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

tide height may be low and may not produce a lot of electricity
start up cost is high?
disrupt the enviroment?
16. (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
17. (Original post by CaSama9)
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

tide height may be low and may not produce a lot of electricity
start up cost is high?
disrupt the enviroment?
18. (Original post by CaSama9)
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

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
19. (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.
20. (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

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