Question

A slab of cross sectional area A and thickness L has a thermal conductivity k. When a temperature difference ΔT is applied across the ends of the slab, a heat flow rate H is observed.

Answer 1

Complete each of the statements below, using the following choices

A.stays the same
B.doubles
C.quadruples
D.decreases by a factor of 2
E.decreases by a factor of 4
F.changes by a factor other than ¼, ½, 1, 2, or 4

i.If A increases by a factor of √2, H _______.
ii.If L increases by a factor of 2 and ΔT increases by a factor of 2, then H _______.
iii.If k increases by a factor of 2, the R factor _______.
iv.If ΔT increases by a factor of 2, then H _______.
v.If L increases by a factor of 2, then H _______.
vi.If A decreases by a factor of 2, then H _______.

Now I've selected i.(change by a factor other than 1/4 etc.)
ii. Stay the same
iii. double
iv. double
v. decrease by factor of 2
vi.doubles
could someone help me to figure out where I went wrong and why?