A list of mediums is given below. (i) wood (ii) water (iii) air (iv) vacuum In which of these mediums can sound travel? (a) i & ii only (b) i, ii & iii only (c) iii & iv only (d) ii, iii & iv only

Answer: (b) i, ii & iii only

To travel, sound required a medium. Sound cannot travel in a vacuum because there is no medium to transmit sound waves.

  • Sound needs a material medium for its propagation like solid, liquid or gas to travel because the molecules of solid, liquid and gases carry sound waves from one point to another.
  • Sound cannot progress through the vacuum because the vacuum has no molecules which can vibrate and carry the sound waves.

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