Question

If ${\theta }_i$, is the inversion temperature,${\theta }_n$ is the neutral temperature, ${\theta }_c$ is the temperature of the cold junction, then

• A. ${\theta }_i+{\theta }_c={\theta }_n$
• B. ${\theta }_i-{\theta }_c=2{\theta }_n$
• C. ${\theta }_n=$$\frac{{\theta }_i+{\theta }_c}{2}$
• D. ${\theta }_c+{\theta }_i=2{\theta }_n$

Answer 1

The correct option is C ${\theta }_n=$$\frac{{\theta }_i+{\theta }_c}{2}$

ln 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:

${\theta }_n-{\theta }_c={\theta }_i-{\theta }_n$

${\theta }_n=\frac{{\theta }_i+{\theta }_c}{2}$