A Stretched String of Length L,fixed at Both Ends,is Vibrating

question 41

Multiple Choice

A stretched string of length L,fixed at both ends,is vibrating in its third harmonic.How far from the end of the string can the blade of a screwdriver be placed against the string without disturbing the amplitude of the vibration?

• A)L/6
• B)L/4
• C)L/5
• D)L/2
• E)None of these is correct.

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