Answers

2016-01-23T00:13:05+05:30
Sound waves work by passing vibrations from molecule to molecule. If there is no medium (a vacuum, which has nothing in it at all), then there are no molecules to pass these vibrations on to. For example, in air, which we know that sound waves pass through, the vibrations are travelling by being passed on by the gas molecule. We hear the sound by the molecules vibrating our ear drums, and our brain interpreting this into sounds.
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2016-01-28T19:12:23+05:30
BECAUSE SOUND  WAVESARE  MECHANICAL WAVES AND MECHANICAL WAVES ARE THOSE WAVES WHICH REQUIRED MEDIUM FOR PROPAGATION BUT LIGHT WAVE ARE ELECTROMAGNETIC WAVES AND ELECTROMAGNETIC WAVES ARE THOSE WHICH DO NOT NEED MEDIUM FOR PROPAGATION.

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