0.345 m.
The wavelength is the distance that the wave travels in each cycle. The wave travels 345 meters in each second. Let the wavelength of this wave be [tex]\lambda[/tex]. That's the distance the wave travels in one cycle.
The frequency of the sound wave is 1 000 Hz, meaning that there are 1 000 cycles in each second. The wave travels a distance of 1 000 wavelengths in one second. That would be a distance of [tex]1,000\;\lambda[/tex].
From the speed of the wave, the wave travels 345 meters in one second. In other words,
[tex]1,000\;\lambda = 345[/tex].
[tex]\lambda = \dfrac{345}{1,000} = 0.345\;\text{m}[/tex].
To generalize:
[tex]\lambda = \dfrac{v}{f}[/tex],
where
