second problem I need help with is : Two automobiles are equipped with the same

Question

second problem I need help with is :

Two automobiles are equipped with the same singlefrequency horn. When one is at rest and the other is moving toward the first at 19 m/s , the driver at rest hears a beat frequency of 4.0 Hz .

What is the frequency the horns emit? Assume T=20?C.

Problem 12.37 Part A Hz ? The speed of sound in air is u ~ 331 + 0.607 m/s, where At T-18 °C how long must an open organ pipe be to have a fundamental frequency of 392 T is the temperature in °C Express your answer to three significant figures and include the appropriate units. 1- 0.436 m Submit My Answers Give Up Correct Part B If this pipe is filled with helium at 20 C and 1 atm, what is its fundamental frequency? The speed of sound in helium is 1005 m/s. Express your answer to three significant figures and include the appropriate units. - ,. 262 [Hz Submit My Answers Give Up ncorrect; Try Again; 14 attempts remaining

Explanation / Answer

part(b)

f = v/2l = 1005/(2*0.436) = 1152.5 Hz

frequency from rest auto mobile = f1 = f

frequecny from moving auto mobile = f2 = f*v/(v-vs)

beats = f2 - f1

4 = f - ((f*v)/(v-vs))

4 = ((f*343)/(343-19))-f

f = 68 Hz <<--answer

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