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# Physics Gcse Aqa unit 1

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1. Could someone explain the Doppler effect please???? Xx
Thanks
2. change in the observed wavelength and frequency of a wave due to it's source of motion - I think
3. (Original post by EmmanuellaUwaifo)
Could someone explain the Doppler effect please???? Xx
Thanks
When a wave source (anything that emits any type of waves) moves towards the observer, the wavelengths are compressed. Consequently, this causes the waves to have a shorter wavelength, and therefore a higher frequency. As a result of this, (if it is sound waves) the pitch of the sound is higher since the frequency is higher.

When a wave source moves away from the observer, the wavelengths are stretched. Consequently, this causes the waves to have a longer wavelength, and therefore a lower frequency. As a result of this, (if it is sound waves) the pitch of the sound is lower due to the frequency being lower.

Hope this helps
4. Stuff Coming towards you seems to have a higher frequency (and therefore shorter wavelength). Stuff moving away from you seems to have longer wavelengths and lower frequencies.

Simple as.
5. Who's done the p1 aqa paper and knows what's coming up today
6. Start a mark scheme here?
7. (Original post by lukman200)
Start a mark scheme here?
Yeah sure!!!
My exam finishes at 3:00. 3:30 we commence the grouping of ideas ??
8. Can anyone also explain kilowatt hours please

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