Text: According to Max Planck, radiant energy is given off from atomsor molecules in small discrete lots called quanta, and is absorbed in a like manner. The discharge of energy from an atom accompanies the passing of an electron from a high energy level to a lower level (from a larger to a smaller orbit), and the passage of an electron from a smaller to a greater orbit is accompanied by an absorption of energy. The energy discharged is equal to hv, where h is the Planck constant and v is the frequeny of the radiated energy.

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Source: 165