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Q.

What is a Phonon ?

Tags: phonon
Asked by Manoj, 22 Jan '08 06:03 pm
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Answers (5)

 
1.

Phonon, in solid-state physics, a quantum unit of vibrational energy, analogous to the quantum unit of light energy called the photon. Atoms in solids vibrate, in effect, as a result of what may be considered thermal waves, or short sound waves, travelling through the solid. Each wave, in turn, has its own definite frequency, or number of vibrations, u, per second, and can be considered to behave in both a wavelike and a particulate manner. Thus the energy of each wave is bunched in certain discrete amounts, or quanta (see Quantum Theory), called phonons, and the energy of each phonon is given by h u, where h is Planck's constant.
Answered by Vibhutesh, 22 Jan '08 06:04 pm

 
  
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2.

n physics, a phonon is a quantized mode of vibration occurring in a rigid crystal lattice, such as the atomic lattice of a solid.[1] The study of phonons is an important part of solid state physics, because phonons play a major role in many of the physical properties of solids, including a material's thermal and electrical conductivities. In particular, the properties of long-wavelength phonons give rise to sound in solids -- hence the name phonon from the Greek φονή (phonē) = voice.[2] In insulating solids, phonons are also the primary mechanism by which heat conduction takes place.

Phonons are a quantum mechanical version of a special type of vibrational motion, known as normal modes in classical mechanics, in which each part of a lattice oscillates with the same frequency. These normal modes are important because, according to a well-known result in classical mechanics, any arbitrary vibrational motion of a lattice can be considered a ...more
Answered by Justin William, 22 Jan '08 06:06 pm

 
  
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3.

a phonon is a quantized mode of vibration occurring in a rigid crystal lattice, such as the atomic lattice of a solid.
Answered by madhavi, 22 Jan '08 06:04 pm

 
  
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4.

Phonons are similar to holes (as in semiconductors) in that they exist only as perturbations in the medium they exist in. Holes aren't actual particles, they are an absence of an electron, however when Holes exist in a medium full of electrons, they can be regarded as poisitively charged particles and can even have properties such as effective mass ascribed to it.

Phonons are perturbations in the lattice structure of a solid, and possess a definate momentum and energy. Phonons are not particles per se, but we can describe them as such, just as we can desribe holes as charged particles.
Answered by Jiya, 22 Jan '08 06:08 pm

 
  
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5.

Phonon :-in solid-state physics, a quantized particle-like unit of vibrational energy arising from the oscillations of the atoms within a crystal. Any solid crystal, such as ordinary table salt (sodium chloride), consists of atoms bound into a specific repeating three-dimensional spatial pattern called a lattice. Because the atoms have thermal energy, the lattice vibrates
Answered by anupama kumar, 22 Jan '08 06:05 pm

 
  
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