Wave speed

[jazzchan]

Dear all,

if a sound wave of 1.0 kHz in air strikes the surface of a lake and penetrates into water. How can find the frequency of the wave in water ?? and assume the speed of sound in water is 1500 m/s for all frequencies !!

the frequency in air is equal to the frequency in water ??

thanks

jazz

[da_willem]

yes

[HallsofIvy]

The wavelength, however, will change. Frequency, in cycles per second, times wavelength, in meters per cycle is always equal to the wave speed, in meters per second. Since sound travels faster in water, the waves "stretch out".