Does the lenght of a pitch pipe affects its pitch?

The longer the pipe, the longer the sound waves it creates. A longer sound waves creates a lower pitch, and a shorter one makes a higher sound.

The number of notes and the ones they have. Guitar will have 6 notes and an ukulele will have 4.

The resonant frequency produced by each pipe depends on the speed of sound c divided by either 2 x the pipe length L (if it is open on both ends) or 4 x the pipe length L (if it is closed on one...

yes.yes it does. now that i did your stupid homework do the rest by yourself

Higher frequency higher pitch, so, the shorter the wavelength the higher the note.