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Does the sun do any work on earth?

No work is done on the earth revolving around it in perfectly circular orbit.The earth revolves around the sun due to gravitational force of attraction between the sun and the earth.This gravitational force provides centripetal force to the earth to revolve around the sun.Since centripetal force is always directed towards the centre of the orbit.This centripetal force is always perpendicular ...

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Is energy quantized in classical physics?

No,according to classical wave theory the emission of electromagnetic radiations from the surface is continuous. So energy is not quantized in classical physics.But according to photon theory the emission of electromagnetic radiation from the surface is discontinuous.Energy is quantized and radiations are emitted in the form of bundles of energy is called quanta or photon.Each photon has energy given as: ...

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