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NCERT Question 21 Important Deleted for CBSE Board 2022 Exams
NCERT Question 22 Important Deleted for CBSE Board 2022 Exams
Last updated at June 26, 2019 by Teachoo
NCERT Question 20 A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m? Distance of the object from submarine = 3625 m Time taken to receive the signal = 5 s Therefore, Time taken to reach the seabed = 5/2 s Let the speed of sound = v Now, Speed = (𝐷𝑖𝑠𝑡𝑎𝑛𝑐𝑒 )/(𝑇𝑖𝑚𝑒 ) v = 3625/(5/2) v = (3625 × 2)/5 v = 725 × 2 v = 1450 m/s ∴ Speed of sound in water is 1450 m/s.