science
Grade-4-
Easy
Question
Which of the following does not require a medium for propagation?
(a) Sound waves
(b) Lightwaves
(c) Water waves
- (b) and (c) are correct
- (a), (b) and (c) are correct
- (a) and (b) are correct
- Only (b)
Hint:
Light is a non-mechanical wave.
The correct answer is: Only (b)
- Sound waves and water waves are mechanical waves.
- Light is a non-mechanical wave. It doesn't require a medium for propagation.
- So, the correct option is d.
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