What is the frequency of a sound wave moving through 20C air with a wavelength of 1.25 m?

To find the frequency of a sound wave, you can use the formula ( f = \frac{v}{\lambda} ), where ( v ) is the speed of sound in air and ( \lambda ) is the wavelength. At 20°C, the speed of sound in air is approximately 343 m/s. Given a wavelength of 1.25 m, the frequency is ( f = \frac{343 , \text{m/s}}{1.25 , \text{m}} \approx 274.4 , \text{Hz} ).