The siren on an ambulance is emitting a sound whose frequency is 2150 Hz. The sp

Question

The siren on an ambulance is emitting a sound whose frequency is 2150 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 26.5 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 26.5 m/s and you are moving toward it at a speed of 13.0 m/s, find the wavelength and frequency of the sound you hear.

Explanation / Answer

n = 2150 Hz c = n ? = 343 m/s a ) ? = 343/ 2150 = 0.159 m . n = 2150 Hz b) Source is moving and observer is at rest. n’ = c n /(c-Vs) = 343 * 2150/ ( 343 –26.5) = 2330 Hz ? = 343/ 2330 = 0.1472m c) Source and observer are moving toward each other n’ = ( c + Vo) n /(c-Vs) = ( 343 + 13.0)* 2150 / ( 343 – 26.5) n’ = 2418.3 Hz ? = 343/ 2418 = 0.1418 m

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

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