Final answer:
The wavelength of a sound wave with a speed of 320 m/s and a frequency of 257 Hz is approximately 1.24 m, so the correct answer is a. 1.24 m.
Step-by-step explanation:
The wavelength of a sound wave can be calculated using the formula λ = v / f, where λ is the wavelength, v is the speed of sound, and f is the frequency. Given the speed of sound is 320 m/s and the frequency is 257 Hz, we can calculate the wavelength as follows: λ = 320 m/s / 257 Hz = 1.2455 m, which is approximately 1.24 m. Therefore, the correct answer is a. 1.24 m.