A sonar system fixed in a submariene operatres at a frequency 40KHz. An enemey submarine moves towards the sonar with a speed of `360kmh^(-1)`. What is the frequency of sound reflected by the submarine? Speed of sound in water `1450ms^(-1)?`

Explanation

To solve the problem of finding the frequency of sound reflected by the enemy submarine, we will use the Doppler effect formula. The steps are as follows:

### Step 1: Convert the speed of the enemy submarine from km/h to m/s
The speed of the enemy submarine is given as 360 km/h. We need to convert this speed into meters per second (m/s) using the conversion factor \(1 \text{ km/h} = \frac{1}{3.6} \text{ m/s}\).

\[ \text{Speed of enemy submarine (V)} = 360 \text{ km/h} \times \frac{1 \text{ m/s}}{3.6 \text{ km/h}} = 100 \text{ m/s} \]
...