The number of notes and the ones they have. Guitar will have 6 notes and an Ukulele will have 4.
It depends on the individual and whether they are a visual or audio person. I think it is harder to do it with a pitch pipe. But part of it will depend on your 'ear' and how good it is musically.
Pipe organ has the most harmonics.
The shorter the pipe the higher the pitch. Conversely the longer the pipe the lower the pitch.
If you want to teach yourself to play the guitar, the first thing you will need is a guitar and some picks. The second thing you will need is a book on how to play the guitar. and the third thing you will need is a way to tune the guitar, possibly a pitch pipe. Then you will need to tune your guitar. Then you open the book and start learning and practicing.
The related question below talks about the various tunings and strings for an ukulele. The mechanical process is pretty straightforward for those that can be done with a simple knot at the bridge end. Those that have a more complex method are still pretty easy. There are a couple of videos on youtube that show the method of tying the knots. And remember that it will take several days for the strings to stretch and settle to the point where they will hold the tuning for more than a few minutes.
Pitch is directly proportional to the size of the pipe.
A pitch pipe.
what is the difference between the PE pipe and HDPE pipe.
there is no difference, half pipe snowboarding is just regualr snowboarding on a half pipe
You cant you either have to do it by ear or with something to compare the sound to like a pitch pipe or another guitar already tuned like that. Although there might be a tuner designed specifically for it most tuners are designed to standard (EADGBE) Tuning.
the pipe organ
The main difference is the thickness of the pipe Compare to A Class pipe B Class pipe thickness is more.Like that Compare to B class pipe C Class pipe thickness is more.