A string with mass per unit length $1$ is under tension T$,.$ A wave traveling along this string has a speed v$1.$ A wave travelingalong a second string has speed v$2.$ If v$2=4$v$1,$ what could be the tension, Iz$,$ and mass per unit length, $2,$ of the second string? $72=2$T$1$; $42=21072=471$;$42=8$M$1072=871$:$12=2111072=1671$:$12=11$

A long string is pulled so that the tension in it increases by a factor of four. If the change in length is negligible, by what factor does the wave speed change?

$4$

$\sqrt[\phantom{2}]{4}$

$\frac{1}{\sqrt[\phantom{2}]{4}}$

$\frac{1}{4}$

$\sqrt[\phantom{2}]{\frac{2}{4}}$