Water and turpentine oil (specific heat less than that of water) are both heated to same temperature

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10-2.Transmission of Heat

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Water and turpentine oil (specific heat less than that of water) are both heated to same temperature. Equal amounts of these placed in identical calorimeters are then left in air

A

Their cooling curves will be identical

B

$A$ and $B$ will represent cooling curves of water and oil respectively

C

$B$ and $A$ will represent cooling curves of water and oil respectively

D

None of the above

Solution

(b) As we know, Rate of cooling $ \propto \frac{{\rm{1}}}{{{\rm{specific}}\;{\rm{heat(c)}}}}$

$\because {c_{{\rm{oil}}}} < {c_{{\rm{Water}}}}$

==> ${({\rm{Rate}}\;{\rm{of}}\;{\rm{cooling}})_{{\rm{oil}}}} > {({\rm{Rate}}\;{\rm{of}}\;{\rm{cooling}})_{{\rm{Water}}}}$

It is clear that, at a particular time after start cooling, temperature of oil will be less than that of water.

So graph $B$ represents the cooling curve of oil and $ A$ represents the cooling curve of water

Standard 11

Physics

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