1. The transference of the energy in a medium due to the oscillatory motion of the particles of a medium about their mean position is known as wave motion.

    The transference of the energy in a medium due to the oscillatory motion of the particles of a medium about their mean position is known as wave motion.

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  2. The waves which need a medium for their propagation are called mechanical waves. e.g. sound waves.

    The waves which need a medium for their propagation are called mechanical waves. e.g. sound waves.

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