What indicates a low pitch in sound?

A low pitch in sound is primarily associated with longer wavelengths. In the context of sound waves, pitch is determined by the frequency of the wave: lower frequencies correspond to lower pitches, while higher frequencies correspond to higher pitches.

When the wavelength of a sound wave is longer, it typically indicates that the frequency is lower; this is because the frequency and wavelength are inversely related. In other words, as the wavelength increases, the frequency decreases, which results in a lower pitch. Therefore, observing a longer wavelength is a direct indicator of a low-pitched sound.

The other aspects mentioned, such as amplitude, do not directly affect the pitch. Amplitude relates to the loudness of a sound, not its pitch, while a higher frequency corresponds to a higher pitch rather than a low one.