A string is fixed at both ends. What is the ratio of the frequency of the first harmonic to that of the second harmonic ?

For a stationary wave set up in a string having both ends fixed , what is the ratio of the fundamental frequency to the second harmonic ?

What is harmonics ?

A string is fixed at the two ends and is vibrating in its fundamental mode. It is known that the two ends will ba at rest. A part from these, is there any position on the string ich can be touched so as not to disturb the motion of the string? What will be the answer to this question if the string is vibrating in its first and second overtones?

A pipe open at both the ends has a fundamental frequency of 600 Hz . The first overtone of a pipe closed at one end has the same frequency as the first overtone of the open pipe. How long are the two pipes ?