On increasing the temperature of solids, the kinetic energy of the particles ________.

This question was previously asked in
RRB JE Previous Paper 14 (Held On: 26 May 2019 Shift 3)
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  1. First increases and then decreases
  2. Is constant
  3. Increases
  4. Decreases

Answer (Detailed Solution Below)

Option 3 : Increases
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CONCEPT:

  • Kinetic energy: The energy possessed by a body due to its motion is called Kinetic energy.
    • Temperature is directly proportional to kinetic energy.
    • If the temperature increases, then the kinetic energy of the particles also increases.
    • Kinetic energy is usually measured in units of Joules(J)
    • Kelvin(K) is the SI unit of temperature.

EXPLANATION:

  • The energy of a molecule in the solid is due to its randomness.
  • If there is a change in the temperature of the solid, the randomness of the molecules will change.
  • Once we increase the temperature, the randomness will increase, and hence the kinetic energy of the molecules increases. So option 3 is correct.
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