Sound is a form of energy that is produced by the vibration of objects and is transmitted by the vibration of air and objects.
Sound and light are forms of energy.
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There are a variety of sounds in our environment. Sounds have characteristics, such as loudness, pitch and quality (or “timbre”), that allow them to be identified.
For sound to occur, there must be a vibrating object, a material through which the vibrations are transferred (for example, air or water), and a receiver (for example, an ear) to perceive the sound.
Objects can be caused to vibrate by actions such as striking, strumming, bowing, plucking or blowing.
Sounds can vary in loudness (“volume”). Volume is affected by the strength of the force causing the vibration. For example, striking a drum forcefully or gently produces sounds with different volumes.
Sounds can have a high or low tone (“pitch”). The pitch of a sound depends on the speed of the vibration. Objects that vibrate quickly have a high pitch, while those that vibrate slowly have a low pitch.