A) \[{{\theta }_{i}}+{{\theta }_{c}}={{\theta }_{n}}\]
B) \[{{\theta }_{i}}-{{\theta }_{c}}=2{{\theta }_{n}}\]
C) \[\frac{{{\theta }_{i}}+{{\theta }_{c}}}{2}={{\theta }_{n}}\]
D) \[{{\theta }_{c}}-{{\theta }_{i}}=2{{\theta }_{n}}\]
Correct Answer: C
Solution :
[c] In Seebeck (thermoelectric) effect, the temperature of hot junction at which the thermo-emf is maximum is called the neutral temperature \[({{\theta }_{n}})\] and the temperature at which thermo-emf changes its sign is called inversion temperature \[({{\theta }_{i}})\]. If \[({{\theta }_{c}})\] is the temperature of cold junction, then these three are related by the expression \[\therefore \] \[{{\theta }_{n}}-{{\theta }_{c}}={{\theta }_{i}}-{{\theta }_{n}}\] \[{{\theta }_{n}}=\frac{{{\theta }_{i}}+{{\theta }_{c}}}{2}\]
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