Question

A motor boat floating on a lake sends a high frequency sound wave in downward direction and

receives the echo after 0.56s. What is the depth of the lake? speed of sound in water is 1500

m/s.​

Answer 1

Answer:

Depth of the lake is 840 m

Explanation:

Given that,

A motor boat floating on a lake sends a high frequency sound wave in downward direction and receives the echo 0.56 seconds.

Speed of the sound in water was 1500m/s

We need to calculate the depth of the lake.

Here,

Depth of the lake = Distance travelled by the sound wave.

Distance travelled by the sound wave is given by :-

→ time × speed.

We are given with,

• time = 0.56 s
• speed = 1500m/s

So,

→ 0.56 × 1500

→ 56/100 × 1500

→ 56 × 15

→ 840.

∴ Distance travelled by the sound wave is 840.

Hence, the depth of the lake is 840 metres.

Answer 2

Answer:

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