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# Doppler effect - Observed frequencies watch

1. So the doppler effect is the apparent change in frequency or wavelength.

The one in the book is to do with wavelengths:

(Observed - emitted) / Emitted = Velocity / Speed of light

How does it change for frequency?

V= f * lambda

f = v/ lambda?

Im a bit stuck, any help is appreciated
2. (Original post by Super199)
So the doppler effect is the apparent change in frequency or wavelength.

The one in the book is to do with wavelengths:

(Observed - emitted) / Emitted = Velocity / Speed of light

How does it change for frequency?

V= f * lambda

f = v/ lambda?

Im a bit stuck, any help is appreciated
Remember that f is inversely proportional to lambda

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