First slide

Conduction

Question

If equal quantities of ice melt completely in two identical containers in 30 and 20 minutes respectively, the thermal conductivities of the material of the two containers are in the
ratio:

Moderate

A

1 : 1
B

1 : 2
C

3 : 2
D

2 : 3

Solution

$\frac{Q}{t} = \frac{mL}{t} \infty K \Rightarrow \frac{K_{1}}{K_{2}} = \frac{t_{2}}{t_{1}}$

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