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8th Class Science Sound Question Bank Sound

  • question_answer
    Sound waves were sent down from a ship and they returned after 2 seconds. What is the depth of the sea, if the speed of sound in water is\[\text{1}\text{.5 km }{{\text{s}}^{\text{-1}}}\]?

    A)  150 m            

    B)  3 km  

    C)  1.5 km           

    D)  750 m

    Correct Answer: C

    Solution :

    Let the depth of the sea \[=\text{ }x\] The time taken by sound wave to go down and then return to the ship = 2 s \[\therefore \] The distance travelled by the sound wave \[=\text{ }x\div x\text{ }=\text{ }2x\] Speed of sound (v) = 1.5 km/s As distance \[=speed\times time,\text{ }2x=1.5\times 2,\text{ }x=1.5\text{ }km\]


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