A violin string is stopped so that the resulting string length makes a desired musical note. In order to make the next higher note,† the string must be shortened using a factor of 2−1/12, or about 0.944. That is, the current length is multiplied by 0.944. The length of an unstopped string is 32 centimeters.   (a)Find a formula for an exponential function that gives the length L, in centimeters, of a string that is stopped to make a tone n notes higher than the unstopped string.   L(n) =    (b)One of the unstopped strings makes an A note. To what length (in centimeters) must the string be stopped in order to make C♯, which is 4 notes higher? (Round your answer to two decimal places.)   cm

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