AQA GCSE PHYSICS UNIT 1 Question Game!

In longitudinal waves, what is it that is compressed and is in rarefaction? - I don't know the answer so please help haha

Reply 62

Original post by Dizgurl

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.

Payback time is the amount of time taken to pay the material used you bought and the answer is 2.5 years because 250/100=2.5

Reply 63

Original post by Dizgurl

payback time is the time it takes for an energy saving installation to pay back the amount of money it took for you to pay for it.

2 and a half years

What is the doppler effect

Reply 64

xxxtentacion..

Original post by leozango

which electromagnetic wave has the highest frequency?

gamma rays

Reply 65

Original post by jazz_xox_

In longitudinal waves, what is it that is compressed and is in rarefaction? - I don't know the answer so please help haha

'Compression happens when molecules are forced, or pressed, together. Rarefaction is just the opposite, it occurs when molecules are given extra space and allowed to expand'- Bitesize

Reply 66

Lxxa14

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?

I think you're meant to say particles Instead of wavelength. But I'm not 100% sure.

Oscillations are parallel to the direction of energy transfer in a longitudinal wave.

Reply 67

Original post by CaSama9

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:

Overhead cables:
+ lower setup cost
+easy to access
+minimal disturbance to land
- can be affected by weather
-visual pollution
-some people believe it affects health

Underground cables
+ no visual pollution
+ not affected as much by weather
- high maintenance costs
- high set up costs

Q: What does the rate of diffraction depend on?

Reply 68

username2312801

Quick question
do you need to know the processes of all the renewable processes ?

Reply 69

Original post by jazz_xox_

Size of the gap

Reply 70

Original post by Mahrez

'Compression happens when molecules are forced, or pressed, together. Rarefaction is just the opposite, it occurs when molecules are given extra space and allowed to expand'- Bitesize

Thank you! I didn't know it was the molecules :colondollar:

Reply 71

Original post by nisha.sri

Quick question
do you need to know the processes of all the renewable processes ?

Yes, somewhat. Just know very briefly what happens, the advantages and disadvantages would be more important :smile:

Reply 72

Original post by LeoZango

Which electromagnetic wave has the highest frequency?

gamma

which which electromagnetic wave has the highest wave length?

Reply 73

Original post by LeoZango

Which electromagnetic wave has the highest frequency?

Gamma Rays

Q: which wave from the electromagnetic spectrum is used for communication, and how and why is it used, with examples. [3]

Reply 74

Original post by CaSama9

gamma

which which electromagnetic wave has the highest wave length?

Radio waves

Q: state the law of conservation of energy

Reply 75

Original post by jazz_xox_

Radio waves

Q: state the law of conservation of energy

energy cannot be created or destroyed but transfered

Reply 76

username2312801

Original post by jazz_xox_

Yes, somewhat. Just know very briefly what happens, the advantages and disadvantages would be more important :smile:

Oh ok thank you :wink:

Reply 77

Original post by jazz_xox_

Gamma Rays

Q: which wave from the electromagnetic spectrum is used for communication, and how and why is it used, with examples. [3]

Well radiowaves are used for communications for example TV signals or radio signals, they're usualy bounced off, diffracted off the ionsphere if the wave lengths are short, if theyre long theyre bend towards the earth to the reciever.

But Microwaves are used for satellite communications, bounced off satellites, and um it's used so that information is transfered from one place to another, e,g phones, satellite phones haha

Describe and explain how a nucleur power station works? 4 marks

Reply 78