A particular steel guitar string has mass per unit length of $1\mathrm{.}85$ g$/$m$.$

a$)$ If the tension on this string is $64\mathrm{.}7$ N$,$ what is the wave speed on the string?

$187\mathrm{.}01$ m$/$s

b$)$ For the wave speed to be increased by $2\mathrm{.}45\%,$ by what percentage should the tension be increased? Do not enter unit.