Question

how can we change the loudness and pitch of the guitar ?​

Answer 1

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The frequency also depends on the length of the string that is free to vibrate. In playing, you change this by holding the string firmly against the fingerboard with a finger of the left hand. Shortening the string (stopping it on a higher fret) gives higher pitch.

Answer 2

Explanation:

If you tune a string of your guitar to different tensions, you get different tones. The greater the tension of a string, the higher the pitch. You couldn't do very much with a guitar, however, if the only way to change pitches was to frantically adjust the tension on the strings every time you pluck a string.