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On January 25, 2024, 11:35 AM

Page No 172: - Chapter 12 Sound class 9 ncert solutions Science - SaraNextGen [2024]


Question 1:

A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?

Answer:

Time taken by the sonar pulse to return, = 1.02 s

Speed of sound in salt water, = 1531 m s−1

Total distance covered by the sonar pulse = Speed of sound × Time taken

Total distance covered by the sonar pulse https://img-nm.mnimgs.com/img/study_content/curr/1/9/8/124/1292/Chapter%2012_html_m5ea01868.gif         …..(i)

Let d be the distance of the cliff from the submarine.

Total distance covered by the sonar pulse = 2d

⇒2d=1561.62              [From (i)]⇒d=780.81 m 

Also Read : Page-No-174:-Chapter-12-Sound-class-9-ncert-solutions-Science

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