Question

When two bodies at different temperatures are placed in thermal contact with each other, heat flows from the body at higher temperature to the body at lower temperature until they both acquire the same temperature. Assuming that there is no loss of heat to the surroundings, the heat:

• A. gained by the hotter body will be equal to the heat lost by the colder body
• B. lost by the hotter body will be equal to the heat gained by the colder body
• C. gained by the hotter body will be less than the heat lost by the colder body
• D. gained by the hotter body will be greater than the heat lost by the colder body

Answer 1

The correct option is B lost by the hotter body will be equal to the heat gained by the colder body

When two bodies at different temperatures are in thermal contact then heat transfer takes place. The heat flows from the hot body to the cold body until both of them acquire the same temperature.
Here it is mentioned that there is no heat loss to the surrounding, so the total heat will remain the same.
Hence we can conclude that heat lost by a hotter body should be equal to the heat gained by a colder body.