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प्रश्न
A ship on the surface of water sends a signal and receives it back from a submarine inside water after 4 s. Calculate the distance of the submarine from the ship. (The speed of sound in water is 1450 ms-1)
उत्तर
Speed of sound in water V = 1450 ms-1
time to hear echo t = 4s
∴ Distance from Submarine d = `(v xx t)/2`
d = `(1450 xx 4)/2`
= 2900 m
= 2.9 km
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