A fire truck is moving away a stationary observer at 18.2 m/s and has a siren frequency of 790 Hz. The speed of sound is 344 m/s. What is the frequency of the fire truck detected by the observer as the truck moves away? 748 Hz 750 Hz 832 Hz 834 Hz

A guitar string produces a musical note with a wavelength of 78.0 cm. If the speed of the sound in air is 347 m/s, what is the frequency of the note? * 445 Hz 0.29 Hz 290 Hz O 4.4 Hz O 29 kHz

The lower limit of the human singing voice is 65 Hz. What is the wavelength of this frequency in 20 °C air? 5.3 m 2.2 x 104 m 65 m 0.20 m

BF-4 Anabella is standing on the sidewalk as two fire engines traveling in the same direction pass her as shown below. Both fire engines produce the same frequency 1,500Hz. Engine #1 V₁=25.0m/s Anabella Engine #2 V₂=35.0m/s a) What is the frequency Anabella hears from engine #1? Use the speed of sound as 343.0m/s. b) What is the frequency Anabella hears from engine #2? Use the speed of sound as 343.0m/s. c) What beat frequency does Anabella hear?

If a stationary dolphin emits a call at a sound frequency of 53 kHz. The sound wave reflects off a fish moving directly towards the dolphin. And the sound wave echo returns at a frequency of 55 kHz. What is the speed of the fish? The speed of sound is 343 m/s.

An ambulance with a siren emitting a frequency of 1600HZ overtakes and passes a cyclist pedaling a bike at 4 m/s. After being passed, the cyclist hears a frequency of 1590HZ. How fast is the ambulance moving? Temperature of air is 25°C. 2.

A jogger hears a car alarm and decides to investigate. While running toward the car, she hears an alarm frequency of 868.5 Hz. After passing the car, she hears the alarm at a frequency of 844.5 Hz. If the speed of sound is 343 m/s. 1)Calculate the speed of the jogger. (Express your answer to three significant figures.)

An ultrasound unit is being used to measure a patient’s heartbeat by combining the emitted 2.0 MHz signal with the sound waves reflected from the moving tissue of one point on the heart. The beat frequency between the two signals has a maximum value of 520 Hz. What is the maximum speed of the heart tissue?

The speed of sound in air is 340 m/s, and the density of air is 1.2 kg/m³. If the displacement amplitude of a 440-Hz sound wave is 10 μm, what is the intensity of the wave? O 0.16 W/m² O 0.32 W/m² O 12 W/m² O 16 W/m² O 32 W/m²

You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind and you perceive the frequency as 1370 Hz. You are relieved that he is in pursuit of a different speeder when he continues past you, but now you perceive the frequency as 1330 Hz. What is the speed of the police car? The speed of sound in air is 343 m/s.