In an experiment of measuring the mechanical equivalent of heat, a stirrer is placed in the calorimetre filled with hot water.After some time, the exposed end of the stirrer becomes hot.The process(es) that is/ are mainly involved in the transferring of heat processes is/ areI. radiationII. convectionIII. conduction
Correct answer: D. II and III.
- A. I only.
- B. III only
- C. I and II.
- D. II and III.
Explanation
Convection:The hot water in the calorimeter transfers heat to the stirrer through convection, as the warmer water rises and cooler water sinks, creating a circulation of heat.Conduction:The heat from the part of the stirrer immersed in the hot water is then transferred along the stirrer to its exposed end through conduction, as heat energy is transferred through direct contact between the particles of the stirrer material.Therefore, the correct options are II and III.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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