I like to listen to classical music with violins. I wonder when violins were invented?
i have no idea when it was invented ,however they hollow wooden bodys
Yeah, do you know how many strings a violin has? I think three of four.
i believe so, they are very prominent instrument in western classical music
For sure. Every orchestra I have seen has violinists. They sound really good with the performance.
the left hand is used to regulate the sounds length of the strings , 
Oh ok. And the right hand holds the bow right? Can a violin be plucked like a guitar as well?
polyphonic instruments, and is notoriously difficult to master.
General.
Classical guitar technique can be organized broadly into subsections for the right hand, the left hand, and miscellaneous. In guitar, performance elements such as musical dynamic and tonal variation are mostly determined by the hand that physically produces the sound. In other words, the hand that plucks the strings defines the musical expression. Historically, this role has been assigned to the dominant hand which, for the majority of players, is the right hand. Similar reasoning
that the organizers adjusted the new violins, while the old violins were in whatever state the lender had them. She said, "I think we can conclude that, with a very limited amount of playing time and under circumstances that are a lot like those in a violin shop (a dry room, lots of testing), we are just as impressed with the tonality of great new instruments as with the tonality of great old ones." She added, "Honestly, I have no issue with the idea that a