Physics - Sound - Doppler effect - The Doppler Effect
A 5-step lesson. Step 1: 'The Doppler Effect: The apparent change in frequency (pitch) of a wave due to relative motion between source and observer. Named after Christian Doppler (1842).' Step 2: 'Source approaching: Wavefronts arrive more frequently. f_observed = f_source × v/(v - v_source). Freque