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  • Need explanation for: Sound waves travel at 350 m/s through a warm air and at 3500 m/s through a warm air and at 3500 m/s through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from warm air

Sound waves travel at 350 m/s through a warm air and at 3500 m/s through a warm air and at 3500 m/s through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from warm air

  • Option 1)

    decreases by a factor 10

  • Option 2)

    increases by a factor 20

  • Option 3)

    increases by a factor 10

  • Option 4)

    decreases by a factor 20

 

Answers (1)

best_answer

As we know

Effect of frequency on speed of sound -

With change in frequency of sound wave, wavelength also changes so that u lambda = v =: constant

- wherein

Thus, the speed of sound is independent of its frequency.

 

 V_{air}=350 ms^{-1} \ V_{bass}=3500ms^{-1}

\frac{V_{air}}{V_{brass}}=\frac{\lambda _{air}}{\lambda _{brass}}

=>\lambda _{brass}=\lambda _{air}\times\frac{V_{brass}}{V_{air}}

\lambda _{brass}=\lambda _{air}\times\frac{3500}{350}=10\lambda _{air}


Option 1)

decreases by a factor 10

Incorrect

Option 2)

increases by a factor 20

Incorrect

Option 3)

increases by a factor 10

Correct

Option 4)

decreases by a factor 20

Incorrect

Posted by

Aadil

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