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

The latent heat of vaporization.

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The specific heat of vapour.

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The thermal capacity of the vapour.

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The reciprocal of the thermal capacity of the vapour.

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Solution

The correct option is D The reciprocal of the thermal capacity of the vapour.
$T h e s l o p e o f g r a p h = \frac{Δ t e m p e r a t u r e}{Δ H e a t s u p p l i e d}$
$= \frac{1}{t h e r m a l c a p a c i t y}$
$∴$ The slope of segment DE represents the reciprocal of the thermal capacity of the vapour.

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

The correct option is D The reciprocal of the thermal capacity of the vapour.Theslopeofgraph=ΔtemperatureΔHeatsupplied =1thermalcapacity∴ The slope of segment DE represents the reciprocal of the thermal capacity of the vapour.