First slide

Conduction

Question

The area of the glass of a window of a room is 10m² and thickness 2mm. The outer and inner temperature are 40⁰C and 20⁰C respectively. Thermal conductivity of glass in MKS system is 0.2. The heat flowing in the room per second will be

Easy

A

$3 \times {10^4}\;joules$
B

$2 \times {10^4}\;joules$
C

30 joules
D

45 joules

Solution

$\frac{Q}{t} = \frac{{KA({\theta _1} - {\theta _2})}}{l} = \frac{{0.2 \times 10 \times 20}}{{2 \times {{10}^{ - 3}}}} = 2 \times {10^4}J/\sec$

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