Q.

Of the following the fastest process of heat transfer is

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a

conduction

b

convection

c

radiation

d

conduction through silver rod

answer is C.

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Detailed Solution

Radiation is a surface phenomenon. When an atom, residing on the surface of a hot body gains energy, it starts oscillating and quickly emits electro magnetic wave into the surrounding space. Thus radiation of heat occurs and it is a very fast process. So option - (3) is right.
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