Q. 33.9( 10 Votes )
Which of the foll A. i & ii only
B. i, ii & iii only
C. ii, iii & iv only
D. i, ii & iv only
Answer :
Option (iii) is incorrect. As light do not need any medium for propagation. It can also travel in vacuum too. On the other hand, sound needs a medium for propagation. All other options are correct.
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