Q -1) The speed of sound in water is 1500 m/s .How far away from an undersea rock should a deep sea diver be so that he can hear his own echo ?
Q-2) A man standing 825 m away from a cliff fires a gun .After how long will he hear it's echo ? speed of sound in air is 330m/s .
Q-3)A sonar station picks up a return signal after 3 seconds .How far away is the object ?{Speed if sound in water = 1440m/s }
Q-4) What is the difference between gravitational potential energy and elastic potential energy ..
***please give correct ans. ....
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1.) v=2d/t and the as the persistence of echo is 17 m so answer will be = 17 m
2.) In this question we will apply v =2d/t
= 2×826/330= 5 sec
3.) it also same v =2d/t
= 1440×3/2 = › 2160 m
4.) Gravitational potential energy is the work done in bringing any body from infinity to a point in the gravitational field
–-»» Elastic potential energy is that which is stored in spring .
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2.) In this question we will apply v =2d/t
= 2×826/330= 5 sec
3.) it also same v =2d/t
= 1440×3/2 = › 2160 m
4.) Gravitational potential energy is the work done in bringing any body from infinity to a point in the gravitational field
–-»» Elastic potential energy is that which is stored in spring .
HOPE IT HELPS U : )
TANU81:
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