The speed of sound in an ideal gas depends only on its temperature and composition. The speed has a weak dependence on frequency and pressure in ordinary air, deviating slightly from ideal behavior.

The speed of sound wave in air depends on? Let's have some stream of consciousness first.
The relevant information to answer the above question is: The speed has a weak dependence on frequency and pressure in ordinary air, deviating slightly from ideal behavior. So, the answer is frequency and pressure.