For a sound wave,
Speed = Wavelength x Frequency
v = λ x f
Speed of sound in air = 344 m/s (Given)
(i) For, f = 20 Hz
λ1= v/f = 344/20 = 17.2 m
(ii) For, f= 20000 Hz
λ2= v/f = 344/20000 = 0.172 m
Hence, for humans, the wavelength range for hearing is 0.0172 m to 17.2 m.
Thanks for solving the answer!