Question

At melting point

• 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

Answer 1

The correct option is A

kinetic energy remains constant and potential energy increases

The explanation for the correct option
(A) Melting point is that point at which the solid changes into the liquid state.

Kinetic energy does not change it remains constant but potential energy increases at the melting point. This is because while melting, the energy is put into breaking the bonds that are holding the particles together.

Hence, at the melting point, kinetic energy remains constant, and potential energy increases.