It depends on how you define a hole. Most have a single sound hole, but there are some models that will have two, one on the side toward the player, so they can hear the sound better. There are also some made with a double F shaped sound holes.
They vary by maker. Usually they will have about 15 frets give or take a couple. I've never seen any Ukulele with less than 12 frets and have seen as many as 21.
14-20 frets
My Makala MK-C concert ukulele has 18.
I have a Lanakai with 20 frets on it.
It will vary some by the maker and the design, but there are normally 12 to 18 frets on a tenor ukulele. I have a Lanakai and it has 18 frets.
I've looked at some pictures and the Baritone size has 21.
The Mahalo UTL1E/BK Telecaster Ukulele has 19 frets on it.
It depends on the maker. My Harmony has 18 frets. The minimum would likely be 12 frets and the more frets you have, the closer together they get, making them harder to play.
The Kamaka Ukulele site lists their HF-4 Baritone with a Manufacturer's Suggested Retail Price of US$1,295.
Ukulele frets are traditionally made of nickel, but can be made of plastic or other metal.
The ukulele is tuned differently then the bass. The baritone ukulele is tuned like the bottom 4 strings of a normal guitar.
It will depend on what sized ukulele and what size guitar as well as how they are tuned. A 'standard' sized ukulele is going to have a higher pitch than most guitars. However, a baritone ukulele is going to be pretty similar to that of a guitar.
Technically, there isn't a bass ukulele. The lowest is the baritone, which is tuned DGBE. If you use a guitar bass or U-bass, it is tuned GDAE.
The Kamaka Ukulele site lists their HF-4 Baritone with a Manufacturer's Suggested Retail Price of US$1,295.
Ukulele frets are traditionally made of nickel, but can be made of plastic or other metal.
The ukulele is tuned differently then the bass. The baritone ukulele is tuned like the bottom 4 strings of a normal guitar.
Move up 12 frets.
It will depend on what sized ukulele and what size guitar as well as how they are tuned. A 'standard' sized ukulele is going to have a higher pitch than most guitars. However, a baritone ukulele is going to be pretty similar to that of a guitar.
Technically, there isn't a bass ukulele. The lowest is the baritone, which is tuned DGBE. If you use a guitar bass or U-bass, it is tuned GDAE.
A standard ukulele is a soprano ukulele. Most soprano, concert and tenor ukuleles are tuned the same, but there are a variety of choices. Most are set up with a G'CEA tuning, but there are other set ups for certain types of music.
You can. A Tenor ukulele is a bit bigger than a standard ukulele, so it might be harder to get the strings to the correct tuning, but it shouldn't be a problem.
It will depend on the tuning and size of the instrument. On the baritone size the lowest note is going to be the D string. On the GCEA tuned ukulele, it will be the C string.
None of the online sources even indicate that John Mayer plays the ukulele. They list guitar, mandolin and piano. It wouldn't be hard for him to play a ukulele, particularly a Baritone Ukulele.
D3 146.8 Hz G3 196.0 Hz B3 246.9 Hz E4 329.6 Hz
ukelele (stringed instrument) Uilleann pipes (bag pipes) Baritone ukulele (stringed instrument)