What frequency is received by a mouse just before being dispatched by a hawk flying at it at 30.0 m/s and emitting a screech of frequency 4000 Hz? Take the speed of sound to be 331 m/s. (A:4400 hz)

A stationary police car emits a sound of frequency 1200 HzHz that bounces off of a car on the highway and returns with a frequency of 1260 HzHz. The police car is right next to the highway, so the moving car is traveling directly toward or away from it. What frequency would the police car have received if it had been traveling toward the other car at 23.0 m/sm/s ?

A bystander hears a siren vary in frequency from 584 Hz to 370 Hz as a fire truck approaches, passes by, and movesaway on a straight street. What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.)

A rescue plane is moving to an emergency beacon that has a frequency of 15.2 kHz. The plane is traveling at 140 m/s.  (a) What is the wavelength of beacon picked up by the plane? (b) Can the people on the plane hear the beacon? (velocity of sound in air is 343 m/s)

an ambulance is approaching you at 22 m/s, sounding its siren at a frequency of 675 Hz? If the speed of sound is 344 m/s , what  frequency do you observe? Your velocity is 0 m/s.

A Doppler flow meter uses ultrasound waves to measure blood-flow speeds. Suppose the device emits sound at 3.5 MHz, and the speed of sound in human tissue is about 1540 m/sWhat is the expected beat frequency if blood is flowing in large leg arteries at 3.0 m/s directly away from the sound source?

A ship mapping the depth of the ocean emits a sound of 37 kHz. The sound travels to the ocean floor and returns 0.65 s later. (a) How deep is the water at that location? (b) What is the wavelength of the wave in water? (c) What is the wavelength of the reflected wave as it travels into the air, where the speed of sound is 350 m/s?

A bat emits a sound whose frequency is 81.8 kHz. The speed of sound in air at 20.0 oC is 343 m/s. However, the air temperature is 41.8 oC, so the speed of sound is not 343 m/s. Assume that air behaves like an ideal gas, and find the wavelength of the sound.

A bat, moving at 3 m/s, is chasing a flying insect. If the bat emits a 40-kHz chirp and receives back an echo at 40.7 kHz, at what speed is the insect moving? (Take the speed of sound in air to be v= 343 m/s.) State your answer to the nearest 0.01m/s. NOTE: Sign of your answer matters! Both of the speeds (insect's and bat's ) are measured with respect to the stagnant air.

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