(a) A high speed train is traveling at a speed of 48 m/s when theengineer sounds

Question

(a) A high speed train is traveling at a speed of 48 m/s when theengineer sounds the 411 Hz warning horn. The speed of sound is 340m/s. What is the frequency of the sound as perceived by a personstanding on at the crossing when the train is approaching?
(b) What is the wavelength of the sound as perceived by aperson standing on at the crossing when the train isapproaching?
(c)What is the frequency of the sound as perceived by a personstanding on at the crossing when the train is leaving?
(d) What is the wavelength of the sound as perceived by aperson standing on at the crossing when the train is leaving?
Can someone help me out?
(b) What is the wavelength of the sound as perceived by aperson standing on at the crossing when the train isapproaching?
(c)What is the frequency of the sound as perceived by a personstanding on at the crossing when the train is leaving?
(d) What is the wavelength of the sound as perceived by aperson standing on at the crossing when the train is leaving?
Can someone help me out?

Explanation / Answer

a) f = f0 (c + v) / c     c = speed of sound      f = 411 * (340 + 48) / 340 = 469 /sec      = c / f = 340 / 469 = .725m c) f = f0 (c - v) / c = 411 * (340 - 48) / 340 =353 / sec      = c / f = 340 / 353 = .963m

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