Answers

2016-01-23T07:27:34+05:30
A light wave is an electromagnetic wave i.e. it is a type of radiation hence it doesn't need a medium to propagate since it travels in form of energy packets called photons
whereas
A sound wave is a mechanical wave which propagates due to the vibration caused by the medium particles which in turn transmit it. Therefore, without a medium, sound waves can't transmit.

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