What is meant by photon & phonon
Answers
Answer:
Photon - A particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass.
"OR"
In physics, a photon is a bundle of electromagnetic energy. It is the basic unit that makes up all light. The photon is sometimes referred to as a "quantum" of electromagnetic energy. Photons are not thought to be made up of smaller particles. They are a basic unit of nature called an elementary particle.
Phonon - A quantum of energy or a quasiparticle associated with a compressional wave such as sound or a vibration of a crystal lattice.
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A phonon is the elementary excitation in the quantum mechanical treatment of vibrations in a crystal lattice or the quantum unit of a crystal lattice vibration. They are analogous to photons, having energy of ћω as quanta of excitation of the lattice vibration mode of angular frequency.
Explanation:
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• A photon is a form of energy but the phonon is a mode of oscillation that occurs in lattice structures.
• A photon is a form of energy but the phonon is a mode of oscillation that occurs in lattice structures.• A photon can be considered as a wave and a particle, which are physically observable entities. A phonon is a mode of vibration, which is neither a wave nor a particle.