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PHYSICS and math OF SOUND

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Stationary sound source

DOPPLER EFFECT

http://video.google.com/videosearch?q=doppler+effect&hl=en&emb=0&aq=f#

Doppler Effect = change in pitch or frequency due to moving sound source or receiver

Sonic boom is a noise similar to thunder caused by an object moving at supersonic speeds, faster than sound, about 750 mph.

- Any elastic material can transmit sound.
- Echoes are reflections from smooth, hard surfaces.
- Echo free rooms sound “dead.”

V = lf

Hz

m/s

m

1/s

- A wave has a frequency of 4.05 hertz and a wavelength of 4.00m. What is the wave’s speed?
f =4.05Hzl = 4.00m

V = lf

v = (4.00m)(4.05Hz)

v = 16.2 m/s

- = V
- f

- f= V
- l

Noah stands 170 meters away from a steep canyon wall. He shouts and hears the echo of his voice one second later. What is the speed of the wave?

Total distance = 170m+170m =340 m

Time = 1 s

v = d/t

v = /

v = 340 m/s

340 m

1 s