Differentiating Between Hot And Cold

Which of the following graphs shows the variation of thermoelectric power with temperature difference between hot and cold junction in thermocouples

An emf of 1 V is developed when the temperature difference between the hot and cold junctions of a thermocouple is 100 K. Assuming that the cold junction is heated by 20 K , determine the percentage change in the thermo emf.

To study energy exchange between hot and cold objects, the system of both objects is isolated from environment by keeping them inside …………

Hot : Cold :: ?