# physics

An  approaching  train  produces  the  RP1 signal (attention  signal)  at  600 Hz . The  train  moves  with  the speed  of  120 km/h. What  is  the  frequency and  the wavelength  of  the  sound
detected  by  a  person  standing  next  to  the  track?

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1. Vt=120000m/h = 120000m/3600s = 33.33 m/s

Fp = ((Vs+Vp)/(Vs-Vt))*Ft
Fp = ((343+0)/(343-33.33))*600 Hz
Fp = (343/309.7)*600 = 664.6 Hz = Freq.
heard by the person.

L = Vs/Fp = 343/664.6 = 0.516 m. = Wave-
length.

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posted by Henry

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