What is meant by Seebeck effect?

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

State the factors on which the temperature of inversion of a thermocouple may depend.

Draw a graph between the temperature and thermo-emf and point out the neutral temperature and temperature of investing in the graph.

Give the direction in which thermoelectric current flows at the hot junction of $\mathrm{Cu}-\mathrm{Fe}$ thermocouple.

Name the temperature for a thermocouple at which its thermoelectric power becomes zero.