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### Electromagnetic spectrum definition

The electromagnetic waves can be characterised by the parameters like wavelength, frequency, phase and state of polarization.

Wavelength :
The distance between two-crust or two throughs is known as wavelength.
Wavelength denoted by λ.

Frequency :

Frequency is the quantity that represents a number of oscillations that particle carries out in unit time.
Frequency denoted by ν.

Wavelength (λ) = c / Frequency (ν)

Where c = velocity of electromagnetic wave

Wavelength × Frequency = Velocity of the wave

The wavelength of the electromagnetic wave varies from 10-12 meters to 104 meters.

Phase :
The electromagnetic wave can be represented by a sine or cosine function.

E = E0 Sin (wt + Φ )
Where E = Position of a wave at time t
E0 = Maximum displacement of Amplitude
(wt + Φ ) = Phase of the wave
Φ = Initial phase or phase difference

Phase difference :
The difference between the phase if the two waves or phase of two position of a single wave is known as phase difference.