Yes, they do. When the tuning fork (or the more modern electronic tone generator) is providing a reference tone, the tuner will strike a key and listen for a beat frequency between the reference and the piano string. With wrench in hand, the person tuning the instrument will take a bit of tension off the string, and will then increase the tension to bring the piano string "up" and equal to the frequency of the reference. The beat frequency will disappear as the tones become equal in frequency. It is the practice of the individuals tuning a piano to always bring a string of the instrument "up" to the frequency of the reference rather than "detuning" the string to lower the pitch and match it with the reference. With a bit of practice and patience ('cause you can always detune the string and "start over" to get it spot on), you can generally do a pretty good job of tuning the piano, though the professionals have been doing it for many years. These experienced folks have a good "ear" for the beat frequencies. The electronic references are modestly priced now, thanks to 21st century electronics. Note that there are cool electronic tuning units that will "listen" to the beat frequency and indicate to you when it disappears and a match has occurred. Our ears are generally fairly sensitive to the difference in the frequencies of two tones. When the tones "beat" on one another because they are being generated simultaneously, the difference between them is usually fairly obvious. Oh, and you are listening to the interference frequency between the two tones, which is what the beat frequency is. Certainly it's a bit of a challenge to accurately tune a piano, but many folks are fairly capable of doing it and only need a modicum of practice. Leave that big Steinway or Yamaha to the experts, but if you've got an old upright, have a go!

No. However, although not all percussion instruments are considered "tuned percussion instruments" they all have pitch. The one example of an instrument that cannot be tuned would be cymbals. However, in in the case of cymbals, manufacturers can chisel away material on the cymbal and alter the shape to produce a specific series of overtones. Even so, the average percussionist cannot easily tune a cymbal to a specific note as he may do to a snare drum with a drum key.

Wavelength = speed /frequency = 332/440 = 75.45 cm(rounded)

3.0 HZ

Any glass of appropriate manufacture (wine glasses are a favorite) will make sound when struck, because the walls of the glass vibrate. Glasses are often filled with water, whether a small amount or nearly to the top, because it limits the part of the glass walls that vibrates, raising the pitch the more water is present. This is the concept behind the Glass Harmonica (normally implemented with multiple water glasses and tuned with water.) Ben Franklyn invented the Glass Armonica by mounting nested, tuned bowls of glass on a spindle so they rotated. If the glass is clean, then wet fingers rubbed around the rim will cause them to make a very tonal pitch. The rotation in the Armonica reduced the need for the player to rub around the rim, allowing it to be used for chordal music appropriate to Franklyn's time.

Could be 259 Hz.

Could be 267 Hz.

Because the vibrations resonate through solid objects.

The tuning fork allows for a standard of pitch for musicians that is very reliable and accurate. Before metal tuning forks, pitch was established using wooden pitch pipes. These pitch pipes were not particularly accurate or reliable.

it would dent it. :)

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.

Not much, really. You strike yours where you are and I'll strike mine 3,000 miles away at precisely the same moment. Suddenly...nothing happens.

I think you're really asking about resonance, which can, in fact, be very powerful. Sound waves reinforcing each other. Works for light, as well. It's called a "laser."

Almost the same frequency and are sounded together.

depends on fork

The frequency of a wave motion is the number of waves passing through a fixed position each second. Thus, the sound wave emitted from the tuning fork has a frequency of 384 Hz means that the fork is vibrating 384 times per second.

It is used as an agricultural implement

Pluck it. Strum it. Flick it. Damn, anything really lol.

But if you mean vibrate so it makes a loud 'vvvvvvvvvvvvvvtttttttttt' noise, pick the string (or pluck it, or whatever) and then gently put your fingernail or a pick on it - GENTLY. the string will make a loud noise, sometimes a little bit like a 'twang'.

x

The frequency of vibration depends on several factors with length being an important one. Stiffness and shape are some others.

the vibrations made by the tuning fork cause the paper to preduce a humming sound.

The vibration may very well break your teeth.

the energy of the lighting from the sun....

Resonance