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Chapter 17: Q40PE (page 595)

What beat frequencies result if a piano hammer hits three strings that emit frequencies of 127.8, 128.1, and 123.8 Hz?

Short Answer

Expert verified

The beat frequencies are 0.3 beat/s, 0.2 beat/s, 0.5 beat/s.

Step by step solution

01

Given Data

The frequency of the first is\[{f_1} = 127.8\;Hz\].

The frequency of the second is\[{f_2} = 128.1\;Hz\].

The frequency of the third is \[{f_3} = 123.8\;Hz\].

02

Calculation of the beat frequency

The beat frequency is,

\[f = \left| {{f_1} - {f_2}} \right|\]

Plugging the values,

\[\begin{aligned}{f_{12}} = \left| {127.8 - 128.1} \right|\\ = 0.3\;beats/s\end{aligned}\]

\[\begin{aligned}{f_{13}} = \left| {128.3 - 127.8} \right|\\ = 0.5\;beats/s\end{aligned}\]

\[\begin{aligned}{f_{23}} = \left| {128.3 - 128.1} \right|\\ = 0.2\;beats/s\end{aligned}\]

Therefore the frequency of first is 0.3 beat/s, second is 0.2 beat/s and the third is 0.5 beat/s.

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Most popular questions from this chapter

(a) What frequency is received by a person watching an oncoming ambulance moving at\(110\;{\rm{km/h}}\)and emitting a steady\(800\;{\rm{Hz}}\)sound from its siren? The speed of sound on this day is\(345\;{\rm{m/s}}\). (b) What frequency does she receive after the ambulance has passed?

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