Which of the following statements are correct?
(i) Sound is produced by vibrations.
(ii)Sound requires a medium for propagation.
(iii)Light and sound both require a medium for propagation.
(iv)Sound travels slower than light.
(a) (i) and (ii)
(b) (i), (ii) and (iii)
(c) (ii), (iii) and
(iv) (d) (i), (ii) and (iv)
(d) Because light can travel in vacuum also but it is only sound which requires medium to travel.