The ratio of thermal conductivity of two rods | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The thermal resistance $R$ of a rod is given by the formula $R = \frac{\ell}{KA}$,where $\ell$ is the length,$K$ is the thermal conductivity,and $

Vedclass · Accepted Answer

$5 : 4$

Vedclass · Answer

(A) The thermal resistance $R$ of a rod is given by the formula $R = \frac{\ell}{KA}$,where $\ell$ is the length,$K$ is the thermal conductivity,and $A$ is the cross-sectional area.Given that the thermal resistances are equal $(R_1 = R_2)$ and the areas are equal $(A_1 = A_2 = A)$:$\frac{\ell_1}{K_1 A} = \frac{\ell_2}{K_2 A}$$\frac{\ell_1}{\ell_2} = \frac{K_1}{K_2}$Given the ratio of thermal conductivities $\frac{K_1}{K_2} = \frac{5}{4}$,it follows that the ratio of their lengths is $\frac{\ell_1}{\ell_2} = \frac{5}{4}$.

The ratio of thermal conductivity of two rods of different materials is $5 : 4$. If the two rods have the same cross-sectional area and the same thermal resistance,what is the ratio of their lengths?

Similar Questions

The radius of an atom is of the order of

The major product of the following reaction is

$CsBr_3$ contains

The joint equation of the lines passing through the origin and trisecting the first quadrant is . . . . . .

If the electron of a hydrogen atom is present in the first orbit,the total energy of the electron is

Vedclass Test Series

Exam Paper Generator

Online Exam Module