SELECT * FROM question_mgmt as q WHERE id=4246 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=8 AND subId=16 AND chapterId=192 and ex_no='11' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)
Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.
Speed of sound in air = 346 m/s
Speed of sound in Aluminium = 6420 m/s
Let the length of the aluminium rod = d.
Therefore, time taken by the sound wave to reach the other end,
Therefore, time taken by sound wave to reach the other end,
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