Other animals can hear sounds at higher vibrations. People with excellent hearing can hear very low sounds, vibrating about 20 times per second, all the way up to high pitches with frequencies of 20,000 vibrations per second. The pitch of a sound is directly related to the frequency of the vibrations of its waves. You hear a sound when its vibrations reach your eardrum, causing it to vibrate. The vibrations are transferred to another medium, usually the air, and travel through it as sound waves. ![]() Did You Know? The form of energy called sound is produced when matter moves or vibrates.
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