Advertisements
Advertisements
Question
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?
Advertisements
Solution
Time taken by the sonar pulse to return, t = 1.02 s
Speed of sound in salt water, v = 1531 m s−1
Total distance covered by the sonar pulse = Speed of sound × Time taken
Total distance covered by the sonar pulse = 1.02 x 1531 = 1561.62 m .....(i)
Let d be the distance of the cliff from the submarine.
Total distance covered by the sonar pulse = 2d
`rArr 2d=1561.62" [From (i)]"`
`rArrd=780.81 m`
RELATED QUESTIONS
How is ultrasound used for cleaning?
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.
Explain the term 'amplitude' of a wave. Draw the diagram of a wave and mark its amplitude on it.
Name the three characteristics of sound.
What type of scans are used these days to monitor the growth of developing baby in the uterus of the mother ?
Write the full name of 'SONAR'.
Explain how, flaws (or defects) in a metal block can be detected by using ultrasound.
What is sonar ? Explain its use.
A sonar station picks up a return signal after 3 seconds. How far away is the object ? (Speed of sound in water = 1440 m/s).
The depth of an ocean can be determined by ______.
