Interference of Sound – Wheel & Tuning Fork

Let us now explain the relationship between the wheel and the tuning fork in more detail. The maximum tine displacement determines the high and low-pressure areas that the tuning fork generates in the surrounding air. The resulting amplitude, or radius of the wheel,
is used to describe these pressure fluctuations.

If the tuning fork vibrations are weaker, the fluctuations in pressure and density decrease. The sound becomes lower. The amplitude is reduced, while the wavelength does not change.

If the vibrations are stronger, the fluctuations in pressure and density rise. The sound becomes louder. The amplitude increases, while the wavelength does not change.

If the tuning fork vibrates slower, the rotation frequency of the phasor decreases. The sound becomes deeper, and the wavelength increases.

If the tuning fork vibrates faster, the rotation frequency of the phasor increases. The sound becomes higher, and the wavelength decreases.