A car moving at 20 m/s emits a 500 Hz horn. If the speed of sound is 340 m/s, find the observed frequency by a stationary listener.
Q1. A car moving at 20 m/s emits a 500 Hz horn. If the speed of sound is 340 m/s, find the observed frequency by a stationary listener.
Answer: 531.25 Hz
Explanation: Use Doppler formula f' = f(v/(v - vs)). Option B applies denominator + vs.