Plugging in the frequency of 440 Hz, you have: Wavelength (λ) = 343 m/s / 440 Hz ≈ 0.78 meters (m) This calculation reveals the wavelength of the sound wave producing the note A4 is ...

Such measurements are designated dBA (see NOISE LEVEL). The sound level meter, however, does not take into account the predominant frequency region of the noise, or other factors which may cause ...