Doppler Effect
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Doppler Effect - General Physcis - Lecture Slides, Slides of Physics
Physics is about nature. This course covers almost every concept related to physics. Important points in this lecture are: Doppler Effect, Moving Source, Wavelength Shift, Frequency Shift, Ambulance, Moving Observer, Shock Wave, Sonic Boom, Speed of Sound, Mach 1
Typology: Slides
2012/2013
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Doppler Effect
Moving Source
Sound moves equally in all directions from a source.
Circular (or spherical) pattern
If the source is moving the origin of successivecircles moves.
Frequency Shift
The period is related to thewavelength.
This can be converted into afrequency shift.
v u v u v T
v
f u
f
v u f v f v
f
v
Insert + for – to get the shiftbehind the source.
Ambulance
An ambulance isapproaching at 130 km/hwith a siren at 1.2 kHz.
What pitch do you hear?
Change speed to m/s
(130 km/h)/3.6 = 36 m/s
Find the Doppler shift.
u/v
= (36 m/s)/(343 m/s)
u/v
= 0.
f’
=
f
/(1-1.05) = 1340 Hz
v
f u
f
Shock Wave
A moving source canexceed the speed ofsound.
The sound wavesconstructively interfere ona front at an angle to themotion.
This is called a
shock
wave
Sonic Boom
The speed of sound is calledMach 1.
Faster than that speedcauses a shock wave – asonic boom.