Yes.
You can purchase a tuning fork on E-bay or any store/shop that sales musical instruments; such as pianos!
Because they're designed that way. A tuning fork can be, well, "tuned" to have any desired frequency. If these are for tuning musical instruments, they sound like very old tuning forks. The "middle C = 256 Hz" scale was in limited use at one time, but by modern standards (where the A above middle C is tuned to 440 Hz, or in some cases even higher) is a bit on the low side. Tuning your instrument to C=256Hz will make it sound "flat".
When using a tuning fork, a plastic beaker is preferred because it minimizes the risk of damaging the fork and prevents any unwanted sound interference that might occur with metal or glass beakers. Plastic is less resonant than metal, allowing for clearer sound production from the tuning fork. Additionally, using a plastic beaker can help avoid any potential injury from breakage.
to asses persons hearing ability specially air conduction versus bone conduction A tuning fork used to be the standard method for checking the musical pitch of instruments. When struck it would vibrate at a definite frequency, which could be heard, and Musical Instruments could then be adjusted to match. Nowadays that is more usually done by electronic oscillators.
The piano has keys. Also organs, piano accordions and xylophones. And drums have a key for tuning. But any note played on an instrument produces a note which is in a key.
All three are true, assuming the definition of "tuned" is flexible. Any percussion instrument makes a certain sound, and most, if not all, will have an element of pitch which can be changed by tuning the instrument (shaving wood off of a woodblock, tightening a drum head, etc). The other two questions are definitely true - idiophones include the snare and timpani (kettledrum), and tuning an instrument means setting it to a certain pitch.
Slides on any valved brass instrument can be adjusted for tuning, but they don't move enough to completely change notes.
Your salad fork, which is usually smaller than your dinner fork , and to the right of any other forks.
Playing any new music instrument needs some practice by the player once he understands the tuning method he can tune by himself accordingly to him and can play any music.
Forks come in two sizes. The larger fork is the salad fork and the smaller fork is the one you eat your main entree with. There is also a salad fork that is about 12" long and has about 3 "Spikes" coming off the end of it and is paired with another fork that is used to "toss" salads (to stir all the ingredients).
It's fine for any brass instrument to be exposed to frigid temperatures. However, if the instrument is played while cold, the tone will be extremely flat. To accommodate for the flatness in tone, move your tuning slide in until the instrument is warmed up.
Most Tuners can be used for any instrument. This particular tuner looks like it was intended for guitar, ukulele, autoharp -- any stringed instrument. The Metronome can be used by any musician for any instrument.