Assertion (A): Rapidly changing temperatures | vedclass

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Question

(A) thermocouple consists of two dissimilar metal wires joined at two junctions. When one junction is kept at a constant temperature and the other is

Vedclass · Accepted Answer

Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A)$

Vedclass · Answer

(A) thermocouple consists of two dissimilar metal wires joined at two junctions. When one junction is kept at a constant temperature and the other is exposed to a changing temperature,a thermoelectric electromotive force $(EMF)$ is generated. Because the junction of a thermocouple is very small,its thermal capacity is extremely low. Thermal capacity is defined as the product of mass and specific heat capacity $(C = mc)$. $A$ low thermal capacity means the junction can gain or lose heat very quickly to reach thermal equilibrium with the surroundings. Therefore,it can respond rapidly to changes in temperature,making it suitable for measuring rapidly changing temperatures. Thus,$(A)$ is true,$(R)$ is true,and $(R)$ is the correct explanation of $(A)$.

Assertion $(A)$: Rapidly changing temperatures can be measured by thermocouples. Reason $(R)$: The thermal capacity of the junction of a thermocouple is very small.

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