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A source of heat supplies heat at a constant rate to a substance. Fig. shows the variation of temperature of the substance with the heat supplied. The slope of segment DE represents:

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The specific heat of vapour

The thermal capacity of the vapour

The reciprocal of the thermal capacity of the vapour

The latent heat of vaporisation

answer is D.

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Detailed Solution

The segment DE represents vapour phase. Slope of DE is rate of temperature increase with heat input which is reciprocal of thermal capacity of the vapour.

ms $△ θ$ = Q $△ t$ $\Rightarrow △ θ \infty \frac{1}{m s}$

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