Temperature is a measure of the average kinetic energy of particles in a substance. It determines the direction of heat flow between objects with heat moving from higher to lower temperature. Temperature is measured in units such as Celsius, Kelvin or Fahrenheit and plays a key role in physical and chemical processes.
Class 11 Physics Chapter 10 Thermal Properties of Matter focuses on concepts like heat transfer specific heat capacity thermal expansion and calorimetry. It explains conduction convection and radiation along with thermal equilibrium and laws of heat transfer. Understanding these principles is essential for solving problems related to thermodynamics in the CBSE Exam 2024-25.
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According to Newton’s law of cooling, the rate of cooling is proportional to the difference between the temperature of the object and the surrounding temperature:
Rate of cooling = k(T_object – T_surrounding)
Let the initial temperature of the object be 600 K and the surrounding temperature be 300 K. If the rate of cooling at 600 K is R, the rate of cooling at a temperature T is proportional to (T – 300).
For the temperature 600 K, the rate of cooling is:
R = k(600 – 300) = 300k
Now, for the temperature 300 K, the rate of cooling will be zero because the temperature difference is zero.
Thus, the correct answer is: 2 R
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