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**Waves and the Doppler Effect**

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Parts of a Wave

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**Wave Properties Wavelength**

Wavelength, l, is the distance between two consecutive peaks.

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**Wave Properties Amplitude**

Amplitude is the height of the wave above or below the equilibrium point.

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**Wave Properties Frequency**

Frequency, f, is the number of waves passing a particular point in one second. Also known as pitch.

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Examples of Frequency What is the frequency of the second hand of a clock? Frequency = 1cycle/60 sec What is the frequency of US Presidential elections? Frequency = 1 election/4 yrs

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8. DOPPLER EFFECT Refers to the change in frequency when there is relative motion between an observer of waves and the source of the waves Doppler with Sound Doppler with Water

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The Doppler effect- Change in frequency due to the source or receiver greater the speed the source, greater the Doppler effect Stationary bug Bug swimming Blue Shift-increase in frequency Red Shift- Decrease in frequency

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Supersonic

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Bow waves V-shaped pattern made by overlapping crest

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Shock Waves Produced by supersonic aircraft, three-dimensional cone shaped Sonic boom – sharp crack heard when conical shell of compressed air that sweeps behind a supersonic aircraft reaches listeners on the ground below.

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