Question

13. The ratio of the areas of cross-section of two rods of
different materials is 1 : 2 and the ratio of the thermal
conductivities of their materials is 4: 3. On keeping
equal temperature-difference between the ends of
these rods, the rate of conduction of heat are equal.
Determine the ratio of the lengths of the rods.​

Answer 1

Answer:

2:3

Explanation:

hava a nice day

and happy new year

Answer 2

Answer:

L1 : L2 = 2:3

Explanation:

Given,

A1/A2 = 1/2

K1/K2 = 4/3

Change Temperature is equal. (∆T1 = ∆T2)

Since,

$\frac{k1 \: a1 \: ∆t}{l1} = \frac{k2 \: a2 \: ∆t}{l2}$

$\frac{l1}{l2} = \frac{4}{3} \times \frac{1}{2}$

$\frac{l1}{l2} = \frac{2}{3}$

Therefore,

l1:l2 = 2:3

Thank You ❤️

Hope it will help you❤️‍