Homework Statement
A string (m = 1 kg) fixed at both ends is vibrating in its second harmonic mode. If the length of the string is 2 m and it feels 50 N of tension, which of the following is NOT a possible harmonic frequency for this string?
a) 1.25 Hz
b) 2.5 Hz
c) 5 Hz
d) 10 Hz
e) 20 Hz...