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Standard X
Physics
Phase Change
Question

At melting point:
  1. kinetic energy remains constant and potential energy increases
  2. both potential energy and kinetic energy increase
  3. kinetic energy increases and potential energy remains constant
  4. potential energy increases with a decrease in kinetic energy

A
kinetic energy remains constant and potential energy increases
B
kinetic energy increases and potential energy remains constant
C
both potential energy and kinetic energy increase
D
potential energy increases with a decrease in kinetic energy
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Solution
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Melting point of solid is defined as the temperature at which the solids changes into liquid state. When the solid molecules are heated thy absorb energy due to which their kinetic energy increases and they start moving in random motion. This random motion increases the potential energy of the molecule and molecule escapes from their fixed positions and starts melting.

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