The n-th harmonic frequency of the standing wave is given by
.
Here , is tension in the string, is mass of the string and is the length of the string. Thus,
.
From the above equation, the frequency can be decreased by decreasing tension or increasing mass and length of the string.
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Answer:
0.0025 sec
Explanation:
Period = 1 / frequency = 1/400 = 0.0025 sec