What is the minimum speed (in m/s) at which a source must travel toward you for you to be able to hear that its frequency is Doppler shifted? That is, what speed produces a shift of 0.210% on a day when the speed of sound is 328 m/s? m/s

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.

Standing at a crosswalk, you hear a frequency of 520 Hz from the siren of an approaching ambulance. After the ambulance passes, the observed frequency of the siren is 436 Hz. Determine the ambulance's speed from these observations. (Take the speed of sound to be 343 m/s.) m/s

A bat at rest sends out ultrasonic sound waves at 54.0 kHz and receives them returned from an object moving directly away from it at 33.0 m/s . What is the received sound frequency?

Standing at a crosswalk, you hear a frequency of 570 Hz from the siren of an approaching ambulance. After the ambulance passes, the observed frequency of the siren is 488 Hz. Determine the ambulance's speed from these observations. (Take the speed of sound to be 343 m/s.)

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 ?

The driver of a car traveling 22.0 m/s sounds his horn as he approaches an intersection. If the horn has a frequency of 555 Hz, what frequency does a pedestrian hear, if she is at rest at the intersection's crosswalk? Assume a sound speed of 343 m/s.

A convertible moves toward you and then passes you; all the while, its loudspeakers are producing a sound. The speed of the car is a constant 13.5 m/s, and the speed of sound is 344 m/s. What is the ratio of the frequency you hear while the car is approaching to the frequency you hear while the car is moving away?

A cop car’s siren has a frequency of 750. Hz. If you are driving towards the cop’s siren at a speed of 20.0 m/s, what frequency would you hear? The speed of sound is 343 m/s.

A bird is flying directly toward a stationary bird- watcher and emits a frequency of 1400 Hz. The bird-watcher, however, hears a frequency of 1430 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?