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a) Can sound travel in vacuum? Explain. 

b) In which medium sound travels much faster and slower? Give some examples.

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a) Sound can’t travel in vacuum as it needs particles for propagation. As vacuum is empty, it is not possible. 

b) Sound travels much faster in solids as the particles in solids are very closely packed, 

e.g.: Sound travels in train tracks (Railway tracks). Sound travels much slower in gases as the particles in gases (air) are very loosely packed. 

e.g.: Thunder or sound produced from amplifier at a long distance is feeble to hear.

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