Question

Question #2808f

Answer 1

The velocity of sound is equal to its wavelength times its frequency in Hz. `v=lambdaf`, where `lamba` is the wavelength and `f` is the frequency. 1 Hertz=`1/"s"`

Scientists have detected infrasonic sound waves with frequencies as low as 13 Hz being produced by elephants. Assuming a speed of sound of 350 m/s, determine the wavelength of these sound waves.

Given:
`f=13"Hz"=13/"s"`
`v=350"m/s"`

Unknown:
`lambda`

Solution:
Solve `v=lambdaf` for `lambda` .

`lambda=v/f=(350m/cancel(s))/(13/cancel"s") = 27"m"`

http://www.physicsclassroom.com/calcpad/sound/problems