(a) What frequency is received by a person watching an oncoming ambulance moving

Question

(a) What frequency is received by a person watching an oncoming ambulance moving at 105 km/h and emitting a steady 893 Hz sound from its siren? The speed of sound on this day is 345 m/s. Hz (b) What frequency does she receive after the ambulance has passed? Hz You set a tuning fork into vibration at a frequency of 603 Hz and then drop it off the roof of the Physics building where the acceleration due to gravity is 9.80 m/s^2. Determine how far the tuning fork has fallen when waves of frequency 581 Hz reach the release point? (Take the speed of sound in air to be 343 m/s.) m

Explanation / Answer

Vs = 105 km/hr = 29.17 m/s ; f = 893 Hz ; V = 345 m/s

a)When its approcahing,

f' = f0 [V/(V - Vs)]

f' = 893 [345/(345 - 29.17)] = 975.48 Hz

Hence, f' = 975.48 Hz

b)When its receding

f' = f0 [V/(V + Vs)]

f' = 893 [345/(345 + 29.17)] = 823.38 Hz

Hence, f' = 823.38 Hz

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

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