Answer :
In the first case in which the string is plucked in the middle produce a louder sound because:
⇒ The loudness of a sound depends upon the amplitude of vibration.
⇒ Greater force means greater amplitude.
⇒ This means, when the string is plucked with greater force, the amplitude of a string is larger.
⇒ Thus, the sound will be louder in this case.
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