A train's whistle produces a sound known to have a frequency of exactly 500 Hz. Standing still with a radar gun directly in the path of an oncoming train movingtoward you, you measure its speed to be 24.8 m/s. Your keen ear perceives a frequency of 538.5 Hz regarding its blowing whistle as it steams towards you. Being thescientist that you are, you proceed to step off of the tracks and use your data to determine the air temperature outside. Measured in degrees Celsius, what do youconclude it to be?

Original frequency (f) = 500 Hzobserved frequency (fo) = 538.5 Hz Speed of train (v) = 24.8 m/s

Answered: A train's whistle produces a sound…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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A pipe open at both ends has a fundamental frequency of 3.00 x 102 Hz when the temperature is 0°C. (a) What is the length of the pipe? (b) What is the fundamental frequency at a temperature of 30.0°C?
A typical adult ear has a surface area of 1.41 × 10-3 m2. The sound intensity during a normal conversation is about 3.02 × 10-6 W/m2 at the listener's ear. Assume that the sound strikes the surface of the ear perpendicularly. How much power is intercepted by the ear?
The speed of sound in air is 331 m/s at atmospheric pressure and 0 Celsius. Suppose you put a electronic pinger in an air-tight glass jar and change the pressure of the air inside by a factor 1.3, while the volume, composition and temperature of the air remain the same. What speed would you measure for the sound inside the jar? Give your answer in m/s.
A physics professor demonstrates the Doppler effect by tying a 600 Hz sound generator to a 1.0-m-long rope and whirling it around her head in a horizontal circle at 100 rpm. What are the highest and lowest frequencies heard by a student in the classroom? Assume the room temperature is 20°C.
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A 38.0-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The density of air at 20.0°C is 1.20 kg/m3. Speed of sound in air at 20.0°C is 343 m/s. What is the displacement amplitude of a 38.0-Hz sound wave? What is the ratio of the displacement amplitude to the average distance between molecules in air at room temperature, about 3.00 nm?
A typical adult ear has a surface area of 2.1 × 10-³ m². The sound intensity during a normal conversation is about 3.2 x 10-6 W/m² at the listener's ear. Assume that the sound strikes 52. the surface of the ear perpendicularly. How much power is intercepted by the ear?
Thank you! A 77.8-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The density of air at 20.0°C is 1.20 kg/m3. Speed of sound in air at 20.0°C is 343 m/s. a) what is the displacement amplitude of a 77.8-Hz sound wave? b) what is the ration of the displacement amplitude to the average distance between molecules in air at room temperature, about 3.00 nm?
You've entered the Great Space Race. Your engines are hearty enough to keep you in second place. While racing, the person in front of you begins to have engine troubles and turns on his emergency lights that emit at a frequency of 5.640 x 1014 Hz. If the person in front of you is traveling 2627 km/s faster than you when he turns on his lights, what is the frequency of the emergency lights that you observe when it reaches you in your spaceship? (Enter your answer to four significant figures.) 4.0 Hz Additional Materials
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?
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