State the law of conservation of energy.

Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side nd llow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a voiltion of the law of conservation of energy?

Prove that the law of conservation of energy is obeyed during interfernce of light.

Prove that the law of conservation of energy is obeyed during intereference of light.

Prove that the law of conservation of energy is obeyed during interference of light.

The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy ? Why ?