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The wall of a house is made of two diffe...

The wall of a house is made of two different materials of same thickness. The temperatures of the outer wall is `T_(2)` and that of inner wall is `T_(1) lt T_(2)`. The temperature variation inside the wall as shown in the figure. Then :

A

thermal conductivity of inner wall is greater than that of outer

B

thermal conductivity of outer wall is greater than that of inner

C

thermal conductivities of the two equal

D

no conclusion can be drawn about thermal conductivities

Text Solution

Verified by Experts

The correct Answer is:
B
The slope of temperature variation is more in inner
`(dQ)/(dt)=(KA)/(l).DeltaT`
`Delta T=(l)/(KA).(dQ)/(dt)`
Slope `alpha (1)/(K)`
Larger the conductivity, smaller is the slope.
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RESONANCE-DAILY PRACTICE PROBLEM-DPP No.49
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