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Question

Following statements which are true for light waves but not for sound waves are/is
(I) The speed of waves is greater in vacuum than in a medium
(II) Waves of different frequencies travel with different speeds in a medium
(III) Waves travel with different speeds in different media.


A
(I) only
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B
(I) and (III)
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C
(II) and (III)
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D
(I), (II) and (III)
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Solution

The correct option is A (I) only
Statements (ii) and (iii) are true for both light waves as well as sound waves statement (1) is true only for light waves because sound waves require a medium for propagation while light waves can travel in the vacuum.
Hence, the answer is (1) only

Physics
NCERT
Standard XII

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