While playing the trumpet, Bob emits a note of frequency200Hz. If the speed of s

Question

While playing the trumpet, Bob emits a note of frequency200Hz. If the speed of sound in air is   va=350m/s
a. What are the period and the wavelength of the soundwave? b. How long will it take for the wave to reach Adam, who is100m away from Bob? c. After hearing the music. Adam runs away from Bob. However,while running, he still hears the    note. Will the frequency of the note be the same for Adamand Bob?

a. What are the period and the wavelength of the soundwave? b. How long will it take for the wave to reach Adam, who is100m away from Bob? c. After hearing the music. Adam runs away from Bob. However,while running, he still hears the    note. Will the frequency of the note be the same for Adamand Bob?

Explanation / Answer

a. T = 1/f = 1/200 s = 0.005 s     = c/f = 350 / 200 m = 1.75 m b. t = L/v = 100/350 s = 1/3.5 s = ..... s c. No, the frequencies will be different due to doppler'deffect.     For Adam, f ' = changed new frequency = f *(c + v)/c

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