Two trains are traveling toward each other at 30.5 m/s relative to the ground. One train is blowing a whistle at 500 Hz. The speed of sound v = 343 m/s. (a) What frequency is heard on the other train in still air? (b) What frequency is heard on the other train if the wind is blowing at 30.5 m/s toward the whistle and away from the listener? (c) What frequency is heard if the wind direction is reversed?

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?

As you stand near a railroad track, a train passes by at a speed of 31.5 m/s while sounding its horn at a frequency of 215 Hz.. What frequency do you hear as the train approaches you? What frequency do you hear while it recedes? Use 344 m/s for the speed of sound in air.

A fire truck moving at 60 m/s sounds its siren whose frequency is 1320 Hz. A car is moving in the same direction as the ambulance at 30 m/s. What frequency does a person in the car hear (a) as the ambulance approaches the car? (b) After the ambulance passes the car?

Doppler Effect: A factory siren indicating the end of a shift has a frequency of 80 Hz where the speed of sound in air is 343 m/s. a)What frequency is perceived by the occupant of a car that is traveling at 30 m/s towards the factory? b)What frequency is perceived by the occupant of a car that is traveling at 30 m/s away from the factory?

Two trains on separate tracks move toward each other. Train 1 has a speed of 149 km/h; train 2, a speed of 95.0 km/h. Train 2 blows its horn, emitting a frequency of 500 Hz. What is the frequency heard by the engineer on train 1?

(a) What frequency is received by a person watching an oncoming ambulance moving at 105 km/h and emitting a steady 753 Hz sound from its siren? The speed of sound on this day is 345 m/s. Hz(b) What frequency does she receive after the ambulance has passed? Hz

(a) What frequency is received by a person watching an oncoming ambulance moving at 130 km/h and emitting a steady 733 Hz sound from its siren? The speed of sound on this day is 345 m/s. Hz (b) What frequency does she receive after the ambulance has passed? Hz

A siren emitting a sound of frequency 1021 Hz moves away from you toward the face of a cliff at a speed of 11.0 m/s. Take the speed of sound in air as 334 m/s. (a) What is the frequency of the sound you hear coming directly from the siren? (b) What is the frequency of the sound you hear reflected off the cliff? (c) What is the beat frequency between the two sounds? (a) Number Units (b) Number i Units (c) Number i Units >

A car is parked 22.0 m directly south of a railroad crossing. A train is approaching the crossing from the west, heading directly east at a speed of 56.0 m/s. The train sounds a short blast of its 346-Hz horn when it reaches a point 22.0 m west of the crossing. What frequency does the car's driver hear when the horn blast reaches the car? The speed of sound in air is 343 m/s. (Hint: Assume that only the component of the train's velocity that is directed towards the car affects the frequency heard by the driver.) Number i Units Hz South East Vtrain VSE