It is easier to play a higher pitched wind instrument(when using this link scroll down to "Terms and Concepts" and go to the second bullet) than a higher pitched wind instrument because sound waves can be large or small, spaced out, or close together. A higher pitched instrument produces sound waves that are smaller and closer together. A lower pitched instrument produces waves that are larger and spread out. It is easier to produce a higher pitched instrument because it is eaiser to produce a sound wave that is closer together and much smaller.