Different molecules and atoms can only release or absorb energy in discrete amounts, according to Planck's theory of quantum mechanics.
Quantum energy is the smallest amount of electromagnetic radiation that can be either emitted or absorbed.
Postulates of max plank:
The following are the postulates of Planck's quantum theory:
The energy is not continuously radiated or emitted. It is released in minute quantities as quanta or energy packets.
Each particle of radiation is referred to as a photon when it takes the form of light. In the case of light, photons are energetic particles that play a little role.
The frequency of the radiation is directly equal to the energy of a photon one or quantum of energy. E = hv, where h is the Planck constant & v is the radiation frequency.
The energy of radiation is denoted by the quantum's energy as a whole number multiple, such as h, 2h, 3h, and so on.