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Topic $12$ HW

The Doppler Effect on a Train

$11$ of $16$

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Constants

Introduction

A train is traveling at$30\mathrm{.}0$m$/$sm$/$s$$relative to the ground in still air. The frequency of the note emitted by the train whistle is$262$HzHz$.$

The speed of sound in air should be taken as$344$m$/$sm$/$s$.$

Part A

What frequency$$fapproachfapproach$$is heard by a passenger on a train moving at a speed of$18\mathrm{.}0$m$/$sm$/$s$$relative to the ground in a direction opposite to the first train and approaching it$?$

Express your answer in hertz.

View Available Hint$($s$)$for Part A

Activate to select the appropriates template from the following choices. Operate up and down arrow for selection and press enter to choose the input value typeActivate to select the appropriates symbol from the following choices. Operate up and down arrow for selection and press enter to choose the input value type

fapproachfapproach$=$

nothing

HzHz

Submit

Part B

What frequency$$frecedefrecede$$is heard by a passenger on a train moving at a speed of$18\mathrm{.}0$m$/$sm$/$s$$relative to the ground in a direction opposite to the first train and receding from it$?$

Express your answer in hertz.

View Available Hint$($s$)$for Part B

Activate to select the appropriates template from the following choices. Operate up and down arrow for selection and press enter to choose the input value typeActivate to select the appropriates symbol from the following choices. Operate up and down arrow for selection and press enter to choose the input value type

frecedefrecede$=$

nothing

HzHz

Submit

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