Читать книгу Engineering Acoustics - Malcolm J. Crocker - Страница 78

From Eq. (3.3) the speed of sound at 20 °C is c = 331.6 + 0.6(20) = 343.6 m/s. Therefore, using Eq. (3.6) the wavelength of a sound of 20 Hz is λ = 343.6/20 = 17.18 m. The wavelength of a sound of 20 kHz is λ = 343.6/20000 = 0.01718 m = 17.18 mm.