Question

A beat equipped with SONAR is sailing in a fresh water lake. It emits a sharp pulse of sound, which is reflected from the bottom of the lake after 0.5 s. Determine the depth of the lake at that spot​

Answer 1

Answer:

The depth of the lake at that spot = 352.5 m.

Explanation:

Given:

• A beat equipped with SONAR is sailing in a fresh water lake.

Since the SONAR is sailing in a fresh water, then velocity of water in fresh water = 1410 m/s.

• It emits a sharp pulse of sound, which is reflected from the bottom of the lake after 0.5 s.

To find:

Depth of the lake at that spot.

Solution:

Time taken (for 1 way journey) = 0.5/2 = 0.25 sec

Now we know that,

Velocity = Distance/Time

→ Distance = Velocity × Time

→ Distance = 1410 × 0.25

= 352.5 m

Hence, 352.5 m is the required solution.