Answer :
Final answer:
A violinist presses the strings of a violin against the fingerboard to alter the pitch of the sounds produced. The position on the string where the violinist presses determines the sound's pitch.
Explanation:
When a violinist presses the string of a violin against the fingerboard, it changes the length of the vibrating portion of the string. This alters the pitch of the sound the string produces when it is bowed or plucked. For example, if the violinist presses down on the string closer to the bridge, it shortens the vibrating portion of the string, thus raising the sound's pitch.
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