Question

Sound signals from an Aircraft carrier are sent towards a submarine situated 75 km away. How long it will take before the sound signals are received onto the submarine ? The speed of sound in water is 1500 m/s
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Answer 1

Answer:

The sensation of any sound persists in our ear for about 0.1 seconds. This is known as the persistence of hearing. If the echo is heard within this time interval, the original sound and its echo cannot be distinguished. So the most important condition for hearing an echo is that the reflected sound should reach the ear only after a lapse of at least 0.1 second after the original sound dies off.

As the speed of sound in water is 1450m/s in the question, the distance traveled by sound in 4 seconds is calculated from the formula

Distance traveled =velocityofsound×timetaken. That is, 1450×4 = 5800 m. This is twice the minimum distance between a source of sound (ship) and the reflector (submarine) as it is reflected sound.

So, the submarine is at a distance of 2900 m or 2.9 km at least from the ship, for the reflected sound or the signal to be heard distinctly.

Answer 2

Answer:1500x75=112500

Step-by-step explanation:that’s literally it I hope this helps and mark me as brainliest!!