An ambulance traveling eastbound at 162.0 km/h with sirens blaring at a frequency of 6.50 × 102 Hz passes cars traveling in both the eastbound and westbound directions at 47.0 km/h. (Assume the speed of sound is 343 m/s.) (a) What is the frequency observed by the eastbound drivers as the ambulance approaches from behind? 776.1 Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. Hz (b) What is the frequency observed by the eastbound drivers after the ambulance passes them? 552.6 × Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. Hz (c) What is the frequency observed by the westbound drivers as the ambulance approaches them? 719.6 Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. Hz (d) What is the frequency observed by the westbound drivers after the ambulance passes them? 596.7 × Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. Hz

Going down the road at 65 miles per hour on a 86.0 °F summer day, Bari heard a siren approaching. Bari knows that a police siren's frequency is 1280.0 Hz, but it didn't sound like that. Bari pulled over a lane, without slowing down, after seeing the flashing lights of the police car coming up from behind, and the police passed going 25 miles per hour faster than Bari was going. (1 mile = 1.60 km) a) what was the speed of sound on that warm summer day? b) How fast, in m/s, was the police car going? c) What frequency did Bari hear from the siren before the police car passed? d) What frequency did Bari hear from the siren after the police care had passed?

If the wind were blowing at 25.0m/s in the same direction you are driving, what frequency would you hear?

A sound wave arriving at your ear is transferred to the fluid in the cochlea. If the intensity in the fluid is 0.410 times that in air and the frequency is the same as for the wave in air, what will be the ratio of the pressure amplitude of the wave in air to that in the fluid? Approximate the fluid as having the same values of density and speed of sound as water. Speed of sound in dry air (20.0°C, 1.00 atm) is 343 m/s, density of dry air (at STP) is 1.29 kg/m3, density of water is 1000 kg/m3, and speed of sound in water is 1493 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?

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.

A car is parked 23.0 m directly south of a railroad crossing. A train is approaching the crossing from the west, heading directly east at a speed of 54.0 m/s. The train sounds a short blast of its 308-Hz horn when it reaches a point 23.0 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.) H train

A train is moving away from an observer at a speed of 50 m/s with its whistle on, the frequency of the whistling sound being 400 Hz. What should be the approximate frequency heard by a stationary observer? Take the speed of sound as 345 m/s when atmospheric temperature is 24°C. 328 Hz 310 Hz 380 Hz 349 Hz

Hassan is driving his truck with a velocity of 18m/s towards a mountain. Kevin who is riding in the truck sounds a horn. The sound reflects from the cliff and is heard by Hassan and Kevin on the truck. What is the change in frequency in hertz if the horn had an initial wavelength of )=0.101 m? The temperature that day was 35 degrees celsius. (Speed of sound = 331+0.6 T(in celsius)). Please give your answer as a whole number.

(a) What frequency (in Hz) is received by a person watching an oncoming ambulance moving at 108 km/h and emitting a steady 950 Hz sound from its siren? The speed of sound on this day is 345 m/s. Hz (b) What frequency (in Hz) does she receive after the ambulance has passed? Hz