Sound may be measured in different ways. Usually these are shown as the wave, frequency, amplitude and time. The strength of the sound depends on these factors, as we mentioned earlier. The higher the frequency, the stronger the impact. If you increase the amplitued, the impact becomes stronger too.
In addition to acoustic waves, there exist a whole other set of sound waves that may be produced. Sound from high-frequency mechanical waves, such as in water-hammer waves, or ultrasonic waves, as well as sound from high pressure air waves. We give only the former (this is because the high-pressure air does not travel very far).Let us first see what happens when sound waves propagate through air. Air is divided into small cells, through which the sound waves travel. When the wave "hits" these cells, it causes pressure variations. This causes the cells to change size or volume, and thus affects the pressure in the surrounding air.
If the frequency of these vibrations is lower than the frequency of the sound wave, it will simply disappear. But if the frequency of the vibrations is greater than that of the wave, it will reinforce the sound wave. That is why a plane will be louder when flying than when stationary. The faster the vibration, the stronger the sound. For example, 100Hz may be twice as strong. 140Hz (sound wave) may be twice as strong as 80Hz (vibration). d2c66b5586