An object vibrating many times a second has high frequency. An object vibrating only a few times a second has a low frequency. Today we will learn about how vibration of sound waves determines if you will hear a high or low sound. We are going to use a bicycle and a piece of cardboard to do this. The slower the bicycle wheel turned, the slower the cardboard would have vibrated and the pitch would have been lower.
Pitch is the highness or lowness of a sound.
Different pitches are made by different vibrations. High pitched sounds are made by vibrations that go back and forth very quickly. Low pitched sounds are made by slower vibrations. If you want the sound to be louder, you add more force. To make a guitar louder, you would hit the strings harder.