In this way, the sound is created - because every time the drum head pushes, pushes the air in front of him. Then, the compressed air forces the air between you and the drum, until the air around the ear, the tympanic membrane pushes his head drum in. When it snaps back into the drum, that sucks the air around it. And that vacuum propagates in the air and sucks his eardrum out. So drum head moves back and forth pushing air between you and the drum back and forth very quickly, which pushes the cylinder back and forth very quickly. When your brain senses the movement of the eardrum, it translates these movements to the sensation we know as sound. So it's all about the air moves back and forth - and therefore there is no sound in space. No air - no sound.Frequency is just how quickly the sound vibrations occur. If the head drum vibrates 100 times per second and has a lower frequency than the other drum head that vibrates at 150 times per second. We hear higher frequencies not higher pitch. So thin string guitar gives you the sound or tone higher than fat because it weighs less string so it can move faster (and therefore pushes the air back and forth faster). And if the threshold string, cut the string and the pitch gets higher. Shorter chain weighs less than the longer chain (less weight), so, once again, it vibrates faster.
Let's go back to our example - drum only this time, we'll be greedy and use two drums. If the drums vibrate at exactly the same frequency and if they vibrate together, the sound will be twice as loud. In other words, it pushes the two drums at the same time so that the air, which pushes the cylinder will be twice our powerful suction and the drum will pull the two rotors in our strength.
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