doppler effect hard

Question

Observed frequency increases if:

RankGuru · Accepted Answer

The Doppler Effect is the change in frequency of a wave due to the relative motion between the source and the observer.
- When the source approaches the observer, it 'catches up' to its own outgoing wave crests, effectively shortening the wavelength ahead of it.
- A shorter wavelength leads to a **higher observed frequency** ($f' > f$).
- Conversely, receding motion increases the wavelength, decreasing the frequency (Redshift).

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doppler effect hard

Select the correct option: