An ambulance siren that is stationary emits a sound wave with a frequency of 1200 Hz . (a). Calculate the frequeney detected by the observer if he is moving away from the ambulance with a speed of \( 30 \mathrm{~m} / \mathrm{s} \). (b). Calculate the frequency detected by the observer if he is moving towards the ambulance with \( 30 \mathrm{~m} / \mathrm{s} \). The speed of sound in air is \( 340.0 \mathrm{~m} / \mathrm{s} \).
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- Frequency of the siren, \( f_s = 1200 \, \text{Hz} \) - Speed of sound in air, \( v = 340 \, \text{m/s} \) - Speed of the observer, \( v_o = 30 \, \text{m/s} \) Show more…
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The siren on an ambulance is emitting a sound whose frequency is 2450 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 14.0 m/s, find the wavelength and frequency of the sound you hear.
The siren on an ambulance is emitting a sound whose frequency is 2450 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 26.1 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 26.1 m/s and you are moving toward it at a speed of 15.0 m/s, find the wavelength and frequency of the sound you hear. (a) λ = 0.14 m fo = 2450 Hz (b) λ' = 0.129 m fo = 2651.78 Hz (c) λ' = 0.124 m fo = 2767.75 Hz
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