Answer :
The frequency of a sound wave is 17000Hertz if its speed is 340m/sec and wavelength is 20cm
For sound wave ,we know an expression
c=ν × λ
where c is the defined as the speed of wave in any medium,
ν is defined as the frequency of the wave and
λ is defined as the wavelength of the wave.
Frequency is the quantity of events of a rehashing occasion for every unit of time. It is likewise sometimes alluded to as worldly recurrence for lucidity, and is unmistakable from rakish recurrence. Frequency is estimated in Hertz (Hz) which is equivalent to one occasion each second. The period is the time frame between occasions, so the period is the corresponding of the frequency.
Now,340m/sec=v×20cm
=>340m/sec=v×0.20m
=>v=340/0.20
=>v=34000/20
=>v=17000/sec
or v=17000Hertz
Hence, frequency is 17000Hertz.
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