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question_answer1) A sonar device on a submarine send out a signal and receives an echo 5 seconds later. Calculate the speed of sound in water, if the distance of the object from the submarine is 3625 m. (a) 1440 m/s (b) 1460 m/s (c) 1450 m/s (d) 1470 m/s
question_answer2) Match the following: Column I Column II (i) The minimum distance between man & wall to (a) echo listen the echo is (ii) SONAR works based on the principle (b) 0.1 sec (iii) Persistence of hearing of human ear (c) 17 m (iv) Reflection of sound (d) Reverberation
question_answer3) An observer, situated between two parallel cliffs, emits an intense sound note. Two successive echoes are then heard after 5s and 7s. Calculate the distance between the cliffs. (Velocity of sound = \[340\text{ }rn{{s}^{-1}})\]
question_answer4) A stone is dropped into a well 44.1 m deep. The sound of the splash is heard 3.13s after the stone is dropped. Find the velocity of sound in air (\[g=9.8m{{s}^{-2}}\])
question_answer5) A boy strikes the iron pipe with a stone. Another boy who keeps his ear close to the other end of the pipe heard two sounds in a short interval of time. Explain why?
question_answer6) What happens to velocity of sound if water vapour content in air is decreased?
question_answer7) Radio waves of speed \[3\text{ }\times \text{ }{{10}^{8}}\text{ }m/s\] are reflected at the moon and received back on earth. The time elapsed between the sending of the signal and receiving it back at the earth station is 2.5s. What is the distance of the moon from the earth?
question_answer8) An observer stands at a distance of 850 m from a cliff and fires a gun. After what time gap will he hear the echo, if sound travels at a speed at \[350\text{ }m{{s}^{-1}}\]in air?
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