Doppler Effect

Theory

When the source moves, wavefronts bunch up ahead and spread out behind. Heard frequency: $f^{\prime }=f\frac{v}{v\mp v_s}$.

What to observe

• The listener in front hears a higher frequency; the one behind, a lower one.

Try this

• Change the source speed vₛ.
• Make vₛ = 0: both hear the same pitch.

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