A sound wave propagating in air has a frequency of 4000Hz. Calculate the percentage change in wavelength when the wavefront initially in a region where `T=27^(@)C` enters a region where temperature decreases to `10^(@)C`.

Explanation

To solve the problem of calculating the percentage change in wavelength of a sound wave when it transitions from a region at 27°C to a region at 10°C, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Given Data:**
- Frequency of the sound wave, \( f = 4000 \, \text{Hz} \)
- Initial temperature, \( T_1 = 27°C = 27 + 273 = 300 \, \text{K} \)
- Final temperature, \( T_2 = 10°C = 10 + 273 = 283 \, \text{K} \)
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