7.3 Doppler effect on sound waves
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5 Terms
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Define the Doppler effect.
The apparent change in frequency of a wave when the source of the wave is moving relative to the observer.
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What happens when the source moves towards the observer?
Sound waves in front are compressed.
Wavelength decreases.
Observer detects a higher frequency than the actual source frequency.
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What happens when the source moves away from the observer?
Sound waves behind are stretched out.
Wavelength increases.
Observer detects a lower frequency than the actual source frequency.
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State the Doppler effect equation.
f₀ = fₛ(v/(v ± vₛ)).
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What is the approximate velocity of sound in air?
340 m/s.
Note 
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