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(a) What is sonar? Explain its use. (b...

(a) What is sonar? Explain its use.
(b) 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)`.

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The correct Answer is:
(b) 2160m
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LAKHMIR SINGH & MANJIT KAUR-SOUND-Exercise
  1. The echo of a sound is heard after 5 seconds. If the speed of sound in...

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  2. The speed of sound in water is 1500 metres per second. How far away f...

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  3. (a) What is sonar? Explain its use. (b) A sonar station picks up a r...

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  4. In SONAR, we use :

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  5. When we change feeble sound to loud we increase its :

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  6. Earthquake produces which kind of sound before the main shock wave beg...

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  7. Before playing the orchestra in a musical concert, a sitarist tries to...

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  8. Note is a sound :

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  9. An echo-sounder in a trawler (fishing boat) receives an echo from a sh...

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  10. The speed of highly penetrating ultrasonic waves is:

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  11. The ultrasound waves can penetrate into matter to a large extent becau...

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  12. The frequencies of four sound waves are given below. Which of these so...

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  13. What type of waves are generated by SONAR device fixed to a fishing sh...

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  14. A student takes some water in a beaker and heats it over a flame for d...

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  15. A student uses a spring balance of least count 10 g wt and range 500 g...

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  16. While performing an experiment on verifying the laws of reflection of ...

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  17. When an object is fully immersed in a liquid, the apparent loss in wei...

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  18. How does the sound produced by a vibrating object in a medium reach yo...

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  19. Explain how sound is produced by your school bell ?

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  20. Why are sound waves called mechanical waves ?

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