H. DE-2 Ray is driving his car at a speed of 25 M/S when he sees a truck in front of him coming toward him with a speed of 35m/s. Ray honks his horn, which has a fregquency of 1,750 Hz, at the truck. a) Make a sketch of the situation showning Ray's car, the truck, and their velocities. b) Find the frequency heard by the truck. c) The sound from Ray's horn reflects off of the front vertical surface of the trúck and Ray hears the echo. Find the frequency heard by Ray by first sketching the situation and then doing the calculation. Be carefui; now the truck is the source (of the reflected wave) and Ray is the receiver. 工工

H. DE-2 Ray is driving his car at a speed of 25 M/S when he sees a truck in front of him coming toward him with a speed of 35m/s. Ray honks his horn, which has a fregquency of 1,750 Hz, at the truck. a) Make a sketch of the situation showning Ray's car, the truck, and their velocities. b) Find the frequency heard by the truck. c) The sound from Ray's horn reflects off of the front vertical surface of the trúck and Ray hears the echo. Find the frequency heard by Ray by first sketching the situation and then doing the calculation. Be carefui; now the truck is the source (of the reflected wave) and Ray is the receiver. 工工

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter13: Mechanical Waves

Section: Chapter Questions

Problem 39P: A driver travels northbound on a highway at a speed of 25.0 m/s. A police car, traveling southbound...

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A police car is traveling east at 40.0 m/s along a straight road, overtaking a car ahead of it moving east at 30.0 m/s. The police car has a malfunctioning siren that is stuck at 1 000 Hz. (a) What would be the wavelength in air of the siren sound if' the police car were at rest? (b) What is the wavelength in front of the police car? (c) What is it behind the police car? (d) What is the frequency heard by the driver being chased?
A train is moving past a crossing where cars are waiting for it to pass. While waiting, the driver of the lead car becomes sleepy and rests his head on the steering wheel, unintentionally activating the cars horn. A passenger in the back of the train hears the horns sound at a frequency of 428 Hz and a passenger in the front hears it at 402 Hz. Find (a) the trains speed and (b) the horns frequency, assuming the sound travels along the tracks.
An ambulance with a siren (f=1.00kHz) blaring is approaching an accident scene. The ambulance is moving at 70.00 mph. A nurse is approaching the scene from the opposite direction, running at vo=7.00 m/s. What frequency does the nurse observe? Assume the speed of sound is v=343.00 m/s.
The Doppler equation presented in the text is valid when the motion between the observer and the source occurs on a straight line so that the source and observer are moving either directly toward or directly away from each other. If this restriction is relaxed, one must use the more general Doppler equation f=(v+vocosovvscoss)f where o and s are defined in figure P13.7la. Use the preceding equation to solve the following problem. A train moves at a constant speed of v = 25.0 m/s toward the intersection shown in Figure P13.71b. A car is stopped near the crossing, 30.0 m from the tracks. The trains horn emits a frequency of 500 Hz when the train is 40.0 m from the intersection. (a) What is the frequency heard by the passengers in the car? (b) If the train emits this sound continuously and the car is stationary at this position long before the train arrives until long after it leaves, what range of frequencies do passengers in the car hear? (c) Suppose the car is foolishly trying to beat the train to the intersection and is traveling at 40.0 m/s toward the tracks. When the car is 30.0 m from the tracks and the train is 40.0 m from the intersection, what is the frequency heard by the passengers in the car now?
A driver travels northbound on a highway at a speed of 25.0 m/s. A police car, traveling southbound at a speed of 40.0 m/s, approaches with its siren producing sound at a frequency of 2 500 Hz. (a) What frequency does the driver observe as the police car approaches? (b) What frequency does the driver detect after the police car passes him? (c) Repeat parts (a) and (b) for the case when the police car is behind the driver and travels northbound.
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(a) At an air show a jet flies directly toward the stands at a speed of 1200 km/h, emitting a frequency of 3500 Hz, on a day when the speed of sound is 342 m/s. What frequency is received by the observers? (b) What frequency do they receive as the plane flies directly away from them?
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