#### Answer

See explanation.

#### Work Step by Step

The fundamental frequency is given by equation 15.35.
$$f_1=\frac{1}{2L}\sqrt{\frac{F}{\mu}}$$
In order to raise the pitch one octave, the fundamental frequency is multiplied by 2, so the tension F must be quadrupled, i.e., multiplied by 4.
In order to raise the pitch two octaves, the fundamental frequency is multiplied by 4, so the tension F must be multiplied by 16.
The danger in doing this is that the string/wire may snap under such a high tension.