Hello, this is a problem about standing waves in a string fixed at both ends, and it says as follows:

A violin string has a length of 0.350 m and is tuned to concert G, with fG=392 Hz. Where must the violinist place her finger to play concert A, with fA= 480 Hz? If this position is to remain correct to one-half the width of a finger (that is, to within 0.600 cm.), what is the maximum allowable percentage change in the string tension?

Please, help needed.

A violin string has a length of 0.350 m and is tuned to concert G, with fG=392 Hz. Where must the violinist place her finger to play concert A, with fA= 480 Hz? If this position is to remain correct to one-half the width of a finger (that is, to within 0.600 cm.), what is the maximum allowable percentage change in the string tension?

Please, help needed.

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