College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A stationary police car emits a sound of frequency 1200 HzHz that bounces off of a car on the highway and returns with a frequency of 1260 HzHz. The police car is right next to the highway, so the moving car is traveling directly toward or away from it.
What frequency would the police car have received if it had been traveling toward the other car at 23.0 m/sm/s ?
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- 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.)arrow_forwardAn ambulance with a siren emitting a frequency of 1600HZ overtakes and passes a cyclist pedaling a bike at 4 m/s. After being passed, the cyclist hears a frequency of 1590HZ. How fast is the ambulance moving? Temperature of air is 25°C. 2.arrow_forwardWhile driving down the road, you spot a friend standing on the sidewalk. You honk your horn at them while driving 60 km/h. Your horn emits a frequency of 330 Hz. V sound = : 343 m/s a. What frequency does your friend hear as you approach? 347 Hz b. What frequency does your friend hear after you pass by? 315 Hzarrow_forward
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- 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.arrow_forwardI need help with this questionarrow_forwardYou are driving down the highway at a speed of 45 m/s when you hear the sound of a police siren that is 200 m behind you. The frequency you hear is 450 Hz. You know, however, that the actual frequency of a police siren is 425 Hz. What is the speed of the police car? Assume the speed of sound is 343 m/s.arrow_forward
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