Ex./90 A car moving at 40 km/hr passes a factory as a siren of frequency 500 Hz is sounded. What does the frequency appear to be to the driver of the car before and after passing by the factory ? [Speed of sound in air = 340 m/s]
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![Ex. 90: A car moving at 40 km/hr passes a
factory as a siren of frequency 500 Hz is
sounded. What does the frequency appear to be
to the driver of the car before and after passing
by the factory ? [Speed of sound in air
= 340 m/s]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4461fea5-1ba5-4b00-b85e-7f53c025c9d6%2Fd46289d5-541f-460d-b46b-0120942e26c1%2F4brvhst_processed.jpeg&w=3840&q=75)
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- This ship is surveying a lake bed with ultrasonic sound that travels 1400 m/s in freshwater. The total time delay of the echo to reach the lake bed and return is 0.6 second. How deep is that part of the lake?12. An ambulance, with sirens frequency of 2000 Hz, was parked by the Palm Bay Road. You were driving fast and detected a frequency difference of 300 Hz (i.e. the change f = 300 Hz) as you approached and left the ambulance. How fast were you driving? Assume the speed of sound is 343m/sec. (1 rn/sec = 2.24 mph)An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 441 Hz when the train is approaching him and 440 Hz when the train is receding from him. Using these frequencies, he calculates the speed of the train. What value does he find? m/s (Assume the speed of sound is 345 m/s.)
- 80. The security alarm on a parked car goes off and produces a frequencyof 960 Hz. The speed of sound is 343 m/s. As you drive toward thisparked car, pass it, and drive away, you observe the frequency to changeby 95 Hz. At what speed are you driving?During a cricket game one fan is located directly behind wickets, 18.3 m from the batter and a second fan, is located in the centerfield bleachers, 127 m from the batter. Both fans observe the batter strike the ball at the same time (because the speed of light is about a million times faster than that of sound), but the fan behind home plate hears the sound first. a) What is the time difference between hearing the sound at the two locations? Use 345 m/s as the speed of sound. b) As the batter hits the ball at a speed of 43,556 m/s and a 220 Hz sound is emitted. If the ball moves in the direction of the first fan what frequency would she observe?A police siren has a frequency of 550 Hz as the police car approaches you and 450 Hz after it has passed you and is moving away. How fast are the police traveling?
- An air controller on an aircraft carrier sees a jet fly over 81 meters above her and she hears the sonic boom when the jet is140 meters past her. What is the speed of the jet if the speed of sound is 344 m/s? (81/140)*344 m/s none of these. (140/81)*344 m/s O (140/344)*81 m/s4. An observer is standing on the platform of a railway station. A train goes through the station without stopping. If the frequency of the train whistle decreases by a factor of 1/4 as it approaches and then passes him, calculate the speed of the train (assume the speed of sound in air = 343 m/s).Ocean waves with a wavelength of 40.0 m travel at 5.00 m/s towards a boat at sea. Determine the number of times the boat bobs up and down per minute as a result of encountering the waves.
- 7. On a given day, the speed of sound in air is 3434m/s. As an emergency vehicle approaches you, youhear a tone that is 1200Hz. That type of emergency vehicle has a siren that emits a tone that is 1050Hz.(a) What is the speed of the vehicle? (b) As it drives away from you, what tone do you hear?While attending a large fireworks event with music, you decide to stay 1 kilometer away because of the crowds. However you have a good view, and you can still hear the booms, as well as the music. Given a speed of sound on a warm moist summer night of 340 m/s, select those that apply. The music is out of phase with the fireworks and occurs about 6 seconds early The booms follow the flashes you see by about 3 seconds. The music is out of phase with the fireworks and occurs about 3 seconds late. The music has the wrong pitch with its frequency changed by the time it takes to reach you. The booms are so loud they occur at the same time as the flash of fireworks explosion.Police radar determines the speed of motor vehicles using the same Doppler-shift technique employed for ultrasound in medical diagnostics. Beats are produced by mixing the double Doppler-shifted echo with the original frequency. If 1.25 × 109 Hz microwaves are used and a beat frequency of 163 Hz is produced, what is the speed of the vehicle in m/s? (Assume the same Doppler-shift formulas are valid with the speed of sound replaced by the speed of light.)