| Photon (electromagnetic wave) has nature of both wave and particle. Hence, we call it an electromagnetic wave and also a photon as a particle. |
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An electromagnetic wave (photon) has some
wavelength (lambda), or frequency (nue), or energy (E).
The wavelength 'lambda' is measured in units of
m, nm, or angstrome,
the frequency 'nue' is of Hz,
and the energy is of joule (J) or erg or eV (electron volt).
 Wavelength and Frequency Electromagnetic WaveUnitSubatomic particles like photons behave as both wave and particle, which is called wavicle by A. Eddington. |
| Light as Wave | Light as Particle | ||||||||||||||||||
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| In some cases, light behaves as wave at some wavelength and frequency with speed of light: it is called electromagnetic wave. | In some cases, light behaves as a particle at some energy and momentum with speed of light: it is called as a photon. | ||||||||||||||||||
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In the case of electromagnetic waves (photons),
which propagate in the vacuum,
the wavelength multiplied by the frequency equals to the speed of light.
Moreover, the energy of photons is proportional to its frequency.
Planck constanth ＝ 6.63×10-34 J/s
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