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February 28, 2015

February 28, 2015

Posted by **guli** on Thursday, January 14, 2010 at 3:49pm.

a) what is the wavelength of the sound the whisle emits?

b)calculat the speed of sound relative to the observer on the bus when the truck is 1)approching the truck and 2)when the moving away from the truck.

c) calculate the frequency of the sound heard by the observer in b-1 and b-2.

- physics -
**drwls**, Thursday, January 14, 2010 at 4:24pma) wavelength = (sound speed)/(frequency) = 1.308 m

b1) 340+30 m/s = ___

b2) 340-30 m/s = ___

c1) Doppler-shifted frequency

= relative speed of sound/(wavelength)

= 370/1.308 = ___ Hz

c2) 310/1.308 = ___ Hz

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