Waves and the Doppler Effect Parts of a Wave Wave Properties Wavelength Wavelength,, is the distance...
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Transcript of Waves and the Doppler Effect Parts of a Wave Wave Properties Wavelength Wavelength,, is the distance...
Waves and the Doppler Effect
Parts of a Wave
Wave PropertiesWavelength
Wavelength,Wavelength,, is the distance between two , is the distance between two consecutive peaks.consecutive peaks.
Wave PropertiesAmplitude
Amplitude is the height of the wave above Amplitude is the height of the wave above or or below the equilibrium point.below the equilibrium point.
Wave PropertiesFrequency
Frequency, f, is the number of waves passing a particular Frequency, f, is the number of waves passing a particular point in one second.point in one second. Also known as pitch.Also known as pitch.
Examples of Frequency
What is the frequency of the second hand of What is the frequency of the second hand of a clock?a clock?
Frequency = 1cycle/60 secFrequency = 1cycle/60 sec
What is the frequency of US Presidential What is the frequency of US Presidential elections?elections?
Frequency = 1 election/4 yrsFrequency = 1 election/4 yrs
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 SoundDoppler with Sound
Doppler with Water
The Doppler effect-Change in frequency due to the source or receiver greater Change in frequency due to the source or receiver greater
the speed the source, greater the Doppler effectthe speed the source, greater the Doppler effect Stationary bug Stationary bug
Bug swimmingBug swimming
Blue Shift-increase in frequency Blue Shift-increase in frequency Red Shift- Decrease in frequencyRed Shift- Decrease in frequency
Supersonic
Bow waves
V-shaped pattern made by overlapping crestV-shaped pattern made by overlapping crest
Shock Waves Produced by supersonic aircraft, Produced by supersonic aircraft,
three-dimensional cone shapedthree-dimensional cone shaped Sonic boom – sharp crack heard Sonic boom – sharp crack heard
when conical shell of when conical shell of compressed air that sweeps compressed air that sweeps behind a supersonic aircraft behind a supersonic aircraft reaches listeners on the ground reaches listeners on the ground below.below.