# wavelength of a buoy

• March 1st 2008, 08:32 PM
lovinhockey26
wavelength of a buoy
For research purposes a sonic buoy is tethered to the ocean floor and emits an infrasonic pulse of sound. The period of this sound is 68.4 ms. Determine the wavelength of the sound.
• March 2nd 2008, 01:33 AM
earboth
Quote:

Originally Posted by lovinhockey26
For research purposes a sonic buoy is tethered to the ocean floor and emits an infrasonic pulse of sound. The period of this sound is 68.4 ms. Determine the wavelength of the sound.

Let p denote the time of one period. Then

$f = \frac1p$ . Plug in the value of p and you'll get

$f = 14.62 \ \frac1s$

I take the value of the sound speed in water from my previous post. From

$f \cdot l = 1485\ \frac ms~\implies~ 14.62 \ \frac1s \cdot l = 1485\ \frac ms$ you can calculate l.

(For confirmation only: 101.6 m)