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# doppler? watch

1. hi! please can somebody explain how i should know when a situation is doppler effect, double doppler or "4 x doppler"? i'm worried this is something i will slip up on on thursday! thankyou
2. (Original post by cazi24633)
hi! please can somebody explain how i should know when a situation is doppler effect, double doppler or "4 x doppler"? i'm worried this is something i will slip up on on thursday! thankyou
Double Doppler? 4x Doppler?
What on earth are you talking about?
3. ooh am i not making any sense? i said i didnt understand it!! ok i'll try this way.. the formula for doppler shift stuff is (Δλ/λ) = (v/c)
but in some questions you have to use (Δλ/λ) = (2v/c), or (Δλ/λ) = (4v/c). my teacher reffered to it as double doppler. any ideas?
4. Yeah, I don't get what Double Doppler is aswell. I've attached a question on it. The answer to part Bii is Double Doppler and in the following question, you have to do something different to normal Doppler shift calculations.

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Taken from AQA PHA5 Jan 2004
Attached Images

5. Looks like it occurs on relection of the wave.

One Doppler shift source - mirror
One doppler shift mirror back to source.
6. ahhhh great! thankyou very much

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