SELECT * FROM question_mgmt as q WHERE id=4234 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='7' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 9th science Sound an echo returned in 3 s what is the distance of t

Question:

An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s-1?

Answer:

Speed of sound, v = 342 m/s

Time taken by sound to travel from the source to reflecting surface, t = 3/2 = 1.5 s

Distance travelled by sound to reflecting surface from the source = v × t = 342 × 1.5  = 513 m


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