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AQA GCSE PHYSICS UNIT 1 Question Game!

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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
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 :frown: could you give a sample answer please! :smile:
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.
Reply 43
Avatar for Mahrez
Mahrez
12
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
Original post by CaSama9
i don't know how to answer that very well :frown: could you give a sample answer please! :smile:


Sure :smile:

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 :h:
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 :tongue:
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]
Reply 47
Avatar for Mahrez
Mahrez
12
What is rarefaction and compression in a sound wave?
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
Reply 49
Avatar for Mahrez
Mahrez
12
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
Original post by Mahrez
thats stupid because thats esentially the cooling effect

You need to also state the obvious to get the mark
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?
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?
(edited 7 years ago)
Reply 53
Avatar for Mahrez
Mahrez
12
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
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?
Reply 55
Avatar for Mahrez
Mahrez
12
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
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?
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 :frown:
Otherwise, all correct :smile:
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.
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?

:tongue:

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