Yes, we can hear a sound wave with a wavelength of 0.2 meters. The audible range for humans typically falls between 20 Hz and 20,000 Hz (or 20 kHz). Wavelength and frequency are inversely related, meaning that as the wavelength decreases, the frequency increases.
The speed of sound in air at room temperature is approximately 343 meters per second. To determine the frequency of a sound wave, we can divide the speed of sound by the wavelength:
Frequency = Speed of sound / Wavelength
In this case, if the wavelength is 0.2 meters, the frequency would be:
Frequency = 343 m/s / 0.2 m = 1715 Hz
Since the frequency of 1715 Hz falls within the audible range for humans, we would be able to hear this sound wave.