Sound travels in air if

Question

MCQ (Single)Sound Propagation Through Different MediaNCERT Exemplar

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Attempt either (I) with all sub parts or (II) with all sub parts from the following two questions-

Attempt either (I) with all sub parts or (II) with all sub parts from the following two questions-

Explain why sound travels faster in water than in air. Include a brief explanation related to the medium's properties.

Most television sets these days can be operated through a REMOTE CONTROL. How do most 'remotes' communicate with TV sets?