Sounds & Vibrations

  • Birds have a ring of cartilage, called syrinx, in their wind pipe.

  • The pitch of sound is determined by its shrillness or flatness.

  • Sounds, of frequency more than 20 kHz, are known as ultrasonic sounds or ultrasound.

  • The S.I. unit of ‘frequency’ is hertz.

  • The S.I. unit of ‘loudness’ of a sound is bel (B).

  • Ultrasounds are produced by dolphins, bats and porpoises.

  • Velocity of sound is 332 meters/second.

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