A stationary listener hears frequency f1 from a source moving directly toward the listener with a speed of 20.0 m/s. When the listener then moves directly toward the source with a speed of 30.0 m/s, the detected frequency f2 differs from f1 by 33.0 Hz. What is the frequency (in kHz) of the source? Take the speed of sound to be 340 m/s

An eagle flying at 28 m/s emits a cry whose frequency is 370 Hz. A blackbird is moving in the same direction as the eagle at 11.05 m/s (assume the speed of sound is 343 m/s).  What frequency does the blackbird hear (in Hz)as the eagle approaches the blackbird?

A sound wave of the form s = Sm cos(kx - wt + p) travels at 344 m/s through air in a long horizontal tube. At one instant, air molecule A at x = 2.03 m is at its maximum positive displacement of 6.00 nm and air molecule B at x = 2.08 m is at a positive displacement of 2.30 nm. All the molecules between A and B are at intermediate displacements. What is the frequency of the 17013 wave? Number Units *1

Dolphins rely on echolocation to be able to survive in the ocean. In a 20 °C ocean, a dolphin produces an ultrasonic sound with a frequency of 105 kHz. Use 1530 m/s for the speed of sound in 20 °C ocean water. What is the wavelength à of this sound, in meters? m While remaining stationary, the dolphin emits a sound pulse and receives an echo after 0.180 s. How far away, in meters, is the reflecting object from the dolphin?

A 38.0-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The density of air at 20.0°C is 1.20 kg/m3. Speed of sound in air at 20.0°C is 343 m/s. What is the displacement amplitude of a 38.0-Hz sound wave? What is the ratio of the displacement amplitude to the average distance between molecules in air at room temperature, about 3.00 nm?

A fire engine siren emits sound at 1260 Hz. The fire engine is driving down the street toward you at 29 m/s. (The speed of sound in air is 343 m/s.) What frequency sound do you hear? What frequency sound do you hear after the fire engine passes you?

Thank you! A 77.8-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The density of air at 20.0°C is 1.20 kg/m3. Speed of sound in air at 20.0°C is 343 m/s. a) what is the displacement amplitude of a 77.8-Hz sound wave? b) what is the ration of the displacement amplitude to the average distance between molecules in air at room temperature, about 3.00 nm?

While sitting next to a road on a calm, warm 27.9ºC evening, you see an ambulance's lights flashing in the distance coming towards you. You hear a frequency of 150 Hz (you have a very keen ear!). However, you know that ambulances have sirens that emit sound at 140 Hz. How fast is the ambulance approaching you, in m/s

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

At rest, a car’s horn sounds at a frequency of 550Hz. When the horn is sounded, while the car is moving down a street, a bicyclist moving at 8.50m/s in the direction opposite to the car hears a frequency of 575Hz. (a) What is the speed of the car? (b) If the cyclist slows down to 2.50m/s before passing the car, what is the new frequency detected by the cyclist? Assume that the car moves with the same speed, and that the speed of sound in air is 343m/s.