The mass per unit length of the E guitar string (a.k.a. the 1st string") is u= 0.401 x10 kg/m. In a standard guitar the length of this string is 640 mm, and if the guitar is properly tuned, the tension force in this string is 71.42 N. The string then plays a tone which is denoted as E4 in the professional scale (we will be talking about that scale some time later). -3 Question one: using the data provided, find the frequency played by the string described, and check whether your result agrees with frequency of the E4 tone (you may find in in the Web). Question two: suppose that in an improperly maintained guitar, Iong time after the last tuning session the tension force in the 1s string dropped from 71.42 N to 70.0 N. If this string were played simultaneously with the 1st string of a properly tuned guitar, what would be the frequency of the beats one would hear?