Final answer:
The frequency of a 2.5m-long sound wave, with sound waves traveling at 330m/s in air, is 132 Hz.
Step-by-step explanation:
To calculate the frequency of a 2.5m-long sound wave when sound waves in air travel at approximately 330m/s, you can use the formula for the speed of a wave, which is velocity (v) = frequency (f) × wavelength (λ). Given the velocity (330 m/s) and the wavelength (2.5 m), the frequency can be found by rearranging the formula as f = v / λ. Thus, the frequency is 330 m/s divided by 2.5 m, which equals 132 Hz.