Standing at a crosswalk, you hear a frequency of 540 Hz from the siren of an approaching ambulance. After the ambulance passes, the observed frequency of the siren is 435 Hz. Determine the ambulance's speed from these observations. (Take the speed of sound to be 343 m/s.)

A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 5.89 104 Hz, and if the speed of sound in air is 343 m/s, what is the smallest insect a bat can detect?mm

You've entered the Great Space Race. Your engines are hearty enough to keep you in second place. While racing, the person in front of you begins to have engine troubles and turns on his emergency lights that emit at a frequency of 5.640 x 1014 Hz. If the person in front of you is traveling 2627 km/s faster than you when he turns on his lights, what is the frequency of the emergency lights that you observe when it reaches you in your spaceship? (Enter your answer to four significant figures.) 4.0 Hz Additional Materials

The CNR trains are supposed to approach crossings at 62 km/hr and begin sounding their train whistles. The whistle produces a loud sound at a frequency of 220 Hz. The owners of the train suspect that the train engineers are exceeding the speed as they approach crossings. To test their assumptions the owners set up a receiver to measure the frequency of the approaching train whistle. As train #5 approaches, the observed frequency of the train whistle is 235 Hz at the stationary receiver. The local speed of sound is 340 m/s. Should the engineer be punished for speeding (how fast is the train going) or rewarded for obeying the rules and why?

A loud vacuum cleaner outputs 1.5 mW of sound energy. What is the intensity of the sound wave 2.0 meters away? (Give your answer in ?μW/m2.)

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 dolphin uses echolocation underwater to "see" its surroundings. If the speed of sound in the ocean is 1530m/s, how long would it take for the dolphin to hear an echo if the ocean floor is 2.57km below it?

A train approaches a platform at a speed of 30 km/h while it blows its whistle. Someone on the platform hears the whistle at 275 Hz. Calculate the actual frequency of the whistle. (speed of sound = 343 m/s)

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.