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Change in frequency and wavelength that take place whenever a source of wave move with respect to any observer.
Johann Doppler (Austrian physicist)
- Sound waves, change in frequency appears clearer as change in pitch of police siren 1st approaches then moves away, same as light.
- Further away, waves stretched, produce longer wave lengths, lower frequencies & vice versa.
Main aspect- relative motion of source wrt observer change all photon frequency and wavelength by ‘fractional amount’.