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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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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