An underwater swimmer sends a sound signal to the surface. If it produces 5 beats per second when compared with the fundamental tone of a pipe of 20 cm length closed at one end, what is the wavelength of sound in water? `("Take" v_("water")=1500 m//s and v_("air")= 360 m//s)`

Explanation

To solve the problem step by step, we will follow the given information and apply the relevant physics concepts.

### Step 1: Identify the given data
- Velocity of sound in water, \( v_{\text{water}} = 1500 \, \text{m/s} \)
- Velocity of sound in air, \( v_{\text{air}} = 360 \, \text{m/s} \)
- Length of the closed organ pipe, \( L = 20 \, \text{cm} = 0.2 \, \text{m} \)
- Beats produced = 5 beats/second

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