The temperature is 220 C and a car is honking its horn at a frequency of 450 Hz. You perceive a frequency of 500 Hz. Is the car moving towards you or away? How fast is the car traveling relative to you?

An emergency vehicle with its siren turned on at a frequency of 790HZ, moves away from a stat ionary observer at a speed 25m/s. What frequency does the observer hear? 698 Hz O 757 Hz 735 Hz 750 Hz

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.

A) a guitar player sounds C above middle C (522 Hz) while traveling in a convertible at 35m/s. If the car is coming toward you, what frequency would you hear? Use 343 m/s as the speed of sound. B) repeat the problem above, but with the car moving away from you. What frequency would you hear?

Sound pulses emitted by a dolphin travel through ocean water at a rate of 1450 m/s  towards a fish and reflect back to the dolphin in 0.2sec. What is the distance between the  dolphin and the fish?

A boat on a river blows a horn at a frequency of 215 Hz. A tugboat traveling thesame direction at a speed twice that of the boat observes a frequency of 235 Hz.What is the speed of the boat?

Two train whistles have identical frequencies of 1.58  102 Hz. When one train is at rest in the station and the other is moving nearby, a commuter standing on the station platform hears beats with a frequency of 4.00 beats/s when the whistles operate together. What are the two possible speeds that the moving train can have? moving away from the station      ?m/s moving towards the station      ?m/s

Two train whistles, A and B, each have a frequency of 404 Hz. A is stationary and B is moving toward the right (away from A) at a speed of 35.0 m/s. A listener is between the two whistles and is moving toward the right with a speed of 15.0 m/s as shown in (Figure 1). Figure ▾ Part A VB = 35.0 m/s VA = 0 V₁ = 15.0 m/s What is the frequency from A as heard by the listener? Express your answer in hertz. ΜΕ ΑΣΦ -421.67 ? Hz You have already submitted this answer. Enter a new answer. No credit lost. Try again. Submit Previous Answers Request Answer Part B What is the frequency from B as heard by the listener? Express your answer in hertz. ΜΕ ΑΣΦ f2 = ? Hz B 1 of 1

Two trumpeters are slightly out of tune, and 2 beats per second are heard. One of them plays a B♭at 233 Hz. What might the other trumpet player’s frequency be?

An object is moving away from a stationary observer at a rate of 25 m/s. While moving the object is emitting a sound wave of 750 MHz. What frequency does the observer hear?