he siren on an ambulance is emitting a sound whose frequency is 2850 Hz. The spe

Question

he siren on an ambulance is emitting a sound whose frequency is 2850 Hz. The speed of sound is 343 m/s. (a) If the ambulance is stationary and you (the "observer") are sitting in a parked car, what are the wavelength and the frequency of the sound you hear? (b) Suppose that the ambulance is moving toward you at a speed of 26.8 m/s. Determine the wavelength and the frequency of the sound you hear. (c) If the ambulance is moving toward you at a speed of 26.8 m/s and you are moving toward it at a speed of 16.0 m/s, find the wavelength and frequency of the sound you hear.

Explanation / Answer

Here ,

f0 = 2850 Hz

v = 343 m/s

a) for the frequency heard

as both source and observer is at rest

the frequency heard is 2850 Hz

wavelength = 343/2850 = 0.120 m

the wavelength is 0.120 m

b) for the moving ambulance

frequency = 2850 * (343 + 26.8)/343

frequency = 3072 Hz

wavelength = 343/3072 = 0.111 m

c)

frequency = 2850 * (343 + 26.8)/(343 - 16)

frequency = 3223 Hz

wavelength = 343/3223 = 0.106 m

Related Questions

Navigate

• Browse (All)
• Browse H
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.