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Hello,

So I have been trying to do this question but I can't figure out how to do it as there appears to be too many variables to solve for. The question is =

"A train travelling at constant speed through a station. To a person standing on the platform, the note emitted from the horn on the train appears to change from 1000 Hz to 800 Hz. If the speed of sound in air is 340 m s¹, find i) the speed at which the train is travelling and ii) the actual frequency of the note emitted by the train. "

I would appreciate a detailed step by step answer.

Thanks ​

Respuesta :

the calculated frequency is 932 Hz.

Even for sensors positioned at significant track offsets, the computation method integrates three different speed calculation techniques to produce estimates for arbitrary train speeds. The second technique is comparable, but it combines a running rms with a previously created "dominant frequency method." The third technique calculates train speed using regression analysis and an analytical vibration frequency prediction model.

given-

train is travelling at a constant speed. f=(π v/L)

The actual frequency of the note emitted by the train.

By applying Doppler effect,

n'=n( v + vs/ v-vs )

=200( 340+220 / 340-220 )

=200( 560/120)

=932 Hz

Learn more about frequency here-

https://brainly.com/question/5102661

#SPJ9

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