Question

The walls of an enclosure are maintained at a steady temperature $T$. When two similarly calibrated thermometers are placed inside the enclosure, they give the same reading $T$ after thermal equilibrium has been established. Which statement correctly describes the required conditions?

• A. under all circumstances
• B. only if they absorb radiation at equal rates
• C. only if they have equal thermal capacities
• D. only if both are perfect absorbers

Answer 1

The correct option is A under all circumstances

Under all circumstances, the two thermometers will show same temperature because the temperature of the enclosure is T