• Production of Sound

    Sound is produced when an object vibrates. The energy required to make an object vibrate and produce sound is provided by some outside source (like when we clap, a sound is produced).

    Vibration means a kind of rapid to and fro motion of an object. The sound of the human voice is produced due to vibrations in the vocal cords. When a bird flaps its wings, we can hear a sound. A stretched rubber band, when plucked, vibrates and produces sound. Sound of a drum or tabla is produced by the vibration of its membrane when struck.

    In laboratory experiments, sound is produced by vibrating a tuning fork. The vibrations of tuning fork can be observed by touching gently a small suspended pith ball (cork ball or a table tennis ball or a small plastic ball by a thread from a support) with a prong of the sounding tuning fork. We will observe that the pith ball is pushed away with a force.

    Sound can be produced by the following methods :

    (i) By vibrating string (sitar)

    (ii) By vibrating air (flute)

    (iii) By vibrating membrane (table, drum)

    (iv) By vibrating plates (bicycle bell)

    (v) By friction in objects

    (vi) By scratching or scrubbing the objects etc.