First slide

Conduction

Question

When temperature of air goes below the freezing point of water a layer of ice is formed on the surface of water in a lake. If at time t thickness of ice layer is x, Then which of the following graphs correctly shows the variation of x with time t?

Easy

A
B
C
D

Solution

$x \propto \sqrt{t} \Rightarrow x^{2} = c . t$ , Which represents a parabola

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