In parts of the Midwestern United States, sirens sound when a severe storm that may produce a tornado is approaching. Mandy is walking at a speed of 1.56 m/s directly toward one siren and directly away from another siren when they both begin to sound with a frequency of 698 Hz. (a) What frequency does she hear from the siren that she is walking toward? (b) What frequency does she hear from the siren that she is walking away from? (c) What beat frequency does Mandy hear? Include a diagram of the situation.

A fire truck sits at rest and emits a sound from its siren with a frequency of 385.0 Hz. If you are biking away from the fire truck at a velocity of 5.200 m/s, what frequency will you hear from the siren? Assume the speed of the sound being emitted from the siren is 327.0 m/s.

the siren of a fire truck that is traveling northward at 40.0 m/s emits a sound wave of frequency 3000 Hz. a car in front of the truck is also traveling northward at 20.0 m/s. the temperature of the calm air outside (not windy) is 10.0 degrees Celcius. (a) what is the frequency of the siren's sound that the car driver hears? (b) what is the frequency of the siren's sound that the fire truck driver hears reflected from the car in front of it?

*82. GO A loudspeaker in a parked car is producing sound whose frequency is 20 510 Hz. A healthy young person with normal hearing is standing nearby on the sidewalk but cannot hear the sound because the frequency is too high. When the car is moving, however, this person can hear the sound. (a) Is the car moving toward or away from the person? Why? (b) If the speed of sound is 343 m/s, what is the minimum speed of the moving car?

A baseball hits a car, breaking its window and triggering its alarm which sounds at a frequency of 1270 Hz. What frequency (in Hz) is heard by a boy on a bicycle riding away from the car at 7.95 m/s? Take the speed of sound to be 343 m/s

Two submarines are underwater and approaching each other head-on. Sub A has a speed of 12.6 m/s and sub B has a speed of 8.99 m/s. Sub A sends out a 1530-Hz sonar wave that travels at a speed of 1522 m/s. (a) What is the frequency detected by sub B? (b) Part of the sonar wave is reflected fromB and returns to A. What frequency does A detect for this reflected wave? (a) Number Units (b) Number Units

You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind and you perceive the frequency as 1370 Hz. You are relieved that he is in pursuit of a different speeder when he continues past you, but now you perceive the frequency as 1330 Hz. What is the speed of the police car? The speed of sound in air is 343 m/s.

Physics Question

A bat at rest sends out ultrasonic sound waves at 54.0 kHz and receives them returned from an object moving directly away from it at 33.0 m/s . What is the received sound frequency?

A bystander hears a siren vary in frequency from 584 Hz to 370 Hz as a fire truck approaches, passes by, and movesaway on a straight street. What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.)