Problem 5 In certain ranges of a piano keyboard, more than one string is tuned to the same note to provide extra loudness. For example, the note at 110 Hz has two strings at this frequency. If one string slips from its normal tension of 600 N to 540 N, what beat frequency is heard when the hammer strikes the two strings simultaneously? a) 1.23 Hz b) 5.64 Hz c) 2.14 Hz d) 3.63 Hz e) 9.23 Hz