Question $19(5$ points$)$

If$,$ with steady state heat flow established, you double the thickness of a wall built from solid uniform material, the rate of heat loss for a given temperature difference across the thickness will

$11$

$$ become four times its original value. also double.

$14$

$15$

become one$-$fourth its original value.

$7$

$18$

become $1/$V$2$ of its original value. become one$-$half its original value.