Question

A ship has anchored in an ocean. The ocean is 10,500 m deep. An
engineer from the ship sent a signal straight down into the water.
How long will it take for the echo to reach him? (velocity of sound in the water. 5km/s)​

Answer 1

Answer:

Time required to by the echo to reach him is 4.2 Sec.

Explanation:

Distance of Both Side : 10,500 + 10,500 = 21,000 m which is equal to 21 KM.

Now time required to is :

5 KM = 1 Sec

then 21 KM = (21 * 1 ) / 5

= 4.2 Sec

Answer 2

Answer:

According to question

It, is given that a Ship has been anchored in an ocean and Ocean is = 10,500 m deep

So , we should change 10,500 in km

1km = 1000 m

So, we have to divide by 1000 to change it in term kilometer

=

$\frac{10500}{1000} = 10.5km$

So, Ocean is 10.5km deep from sea surface

And It's given that velocity of sound in water = 5km/s

and now we will find the time in which the echo will reach to the surface of ocean

So , 5km/s

So , 10.5/5 = 2.1sec

Echo will reach on the surface of ocean by 2.1sec

and according to question the echo has to return to engineer back so the time taken will be same i.e = 2.1sec

and Total Time = Time taken to reach ocean + Time taken to reach the ship back

= 2.1 + 2.1

= 4.2 sec

So, it takes 4.2sec to reach the echo to the ground and back to the ship

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