# Find the wavelength of sound for frequencies up to 120 kHz

Find the wavelength of sound for frequencies up to 120 kHz at which a bat can hear it. Take the speed of sound in air as 344 m

Frequency = v / $\lambda$
Velocity of sound in air , v = 344m/s
Frequency = 120kHz = 120000Hz
$\lambda$ = 344/120000
$\lambda$ = 0.00286666
$\lambda$ = 2.8 x ${{10}^{-3}}$