A whistling train travels past a person standing still. The height of the tone of the whistle sharply changes. If the train moves at 60 km/h then the percentage of the change in the tone from the actual frequency is (a) 15% (c) 20% (b) 10% (d) 25%

A whistling train travels past a person standing still. The height of the tone of the whistle sharply changes. If the train moves at 60 km/h then the percentage of the change in the tone from the actual frequency is (a) 15% (c) 20% (b) 10% (d) 25%

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter17: Sound

Section: Chapter Questions

Problem 142CP: A string has a length of 1.5 m, a linear mass density =0.008 kg/m, , and a tension of 120 N. If the...

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Concept explainers

Shock Waves

Shock waves are common in continuum mechanics, and their dominance is attributable to the fact that they are stronger (or even less) compressible. Substantial perturbations propagated as sudden dynamic changes of a compressible medium supersonically. Shock waves are all around us in our daily lives. Lightning, earthquakes, volcanic eruptions, and meteorite impact all produce them in nature. Even the earth, which is protected by its magnetic field, generates a shock wave as in solar wind that travels around 20 Earth radiuses. These shock waves might be either constant, linked to the body, or unsteady, i.e., moving around with time. All of the shocks mentioned above can be damaging, so precautions must be taken to reduce their impact.

Question

Please provide clear and neat solution

A whistling train travels past a person standing
still. The height of the tone of the whistle
sharply changes. If the train moves at 60 km/h
then the percentage of the change in the tone
from the actual frequency is
(a) 15%
(c) 20%
(b) 10%
(d) 25%

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