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Byju's Answer

Standard XII

Physics

Conduction Law

Give reason :...

Question

Give reason : Ice box has double walls

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Solution

Ice box is a double walled box generally made from iron The space in between walls is filled with glass-wool which is a bad conductor of heat Thus the heat from outside does not reach the ice and hence it does not melt for long time

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An ice box used for keeping eatable cold has a total wall area of $1 m e t r e^{2}$ and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is $K = 0.01 j o u l e / m e t r e -^{\circ} C$ . It is filled with ice at $0^{\circ}$ along with eatables on a day when the temperature is $30^{\circ}$ . The latent heat of fusion of ice is $334 \times 10^{3} j o u l e s / k g$ . The amount of ice melted in one day is
(1 day =86,400 seconds )

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