A wall has two layers a and b

Asked by admin @ in Physics viewed by 336 People

A wall has two layers A and B of equal areas.

Their thicknesses are 10 cm and 20cm.Conductivity of A is twice that of B. Underthermal equilibrium, if the temperaturedifference across the wall is 45°C, thentemperature difference across the layer A is1) 36°C 2) 27°C 3) 18°C4) 9°C​

Answered by admin @


Answer:

For thermal equilibrium,

Energy received by earth = Energy emitted by earth

4πd

2

T

s

4

​

⋅4πR

s

2

​

​

×πR

e

2

​

=σ⋅ρ⋅T

e

4

​

⋅4πR

e

2

​

4×d

2

×e

T

s

4

​

×R

s

2

​

​

=T

e

4

​

(Here, Emissivity of earth e=α×ρ)

⇒

4×(2×10

11

)

2

×0.6

(6000)

4

×(7×10

8

)

2

​

=T

e

4

​

⇒

4×4×0.6

36×36×7×7

​

×10

6

=T

e

4

​

⇒66.15×108=T

e

4

​

T

e

​

=300K.


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