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Electromagnetic waves are coupled periodic electrical and magnetic disturbances generated by oscillating electric charges.
Electromagnetic waves include an enormous range of frequencies- from radio waves with frequencies less than (10 to the power 8) Hz to gamma rays having frequencies greater than 10²º Hz. Visible light is simply electromagnetic radiation in the range of frequencies 4.3*(10 to the power 14) to 7*(10 to the power 14) Hz. There is no sharp distinction between various sections in the complete electromagnetic spectrum, which actually overlap each other. The descriptive names of various sections of the spectrum are merely historical classification, otherwise all the waves, from radio waves to gamma rays are same in nature, differing only in frequency and wavelength. All have the same speed [c= 3*(10 to the power 8) m/s] in vacuum. The relation Speed= frequency * wavelength
holds good for all electromagnetic waves. If the frequency of radio waves sent out by a radio station is known, the wavelength can be calculated by dividing 3*(10 to the power 8) m/s by the given frequency. For example, the wavelength of radio waves sent out by a radio station at frequency 819 kHz is 366m.
Electromagnetic waves include an enormous range of frequencies- from radio waves with frequencies less than (10 to the power 8) Hz to gamma rays having frequencies greater than 10²º Hz. Visible light is simply electromagnetic radiation in the range of frequencies 4.3*(10 to the power 14) to 7*(10 to the power 14) Hz. There is no sharp distinction between various sections in the complete electromagnetic spectrum, which actually overlap each other. The descriptive names of various sections of the spectrum are merely historical classification, otherwise all the waves, from radio waves to gamma rays are same in nature, differing only in frequency and wavelength. All have the same speed [c= 3*(10 to the power 8) m/s] in vacuum. The relation Speed= frequency * wavelength
holds good for all electromagnetic waves. If the frequency of radio waves sent out by a radio station is known, the wavelength can be calculated by dividing 3*(10 to the power 8) m/s by the given frequency. For example, the wavelength of radio waves sent out by a radio station at frequency 819 kHz is 366m.
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Electromagnetic radiation is usually explained as a self-propagating wave in space which has electric as well as magnetic components. These components fluctuate at right angles and also towards the direction of propagation.
Electromagnetic radiation is characterized into different forms on the basis of the frequency of the wave. Electromagnetic waves of much lesser frequency than noticeable were initially predicted by Maxwell's equation and later revealed by Heinrich Hertz. On the basis of these equations, a time-varying electrical field produces a magnetic field and vice versa.
A vital characteristic of the nature of light is frequency; frequency of a wave is its rate of oscillation and is usually calculated in hertz, the SI unit of frequency, which is equivalent to one oscillation per second.
Electromagnetic radiation is characterized into different forms on the basis of the frequency of the wave. Electromagnetic waves of much lesser frequency than noticeable were initially predicted by Maxwell's equation and later revealed by Heinrich Hertz. On the basis of these equations, a time-varying electrical field produces a magnetic field and vice versa.
A vital characteristic of the nature of light is frequency; frequency of a wave is its rate of oscillation and is usually calculated in hertz, the SI unit of frequency, which is equivalent to one oscillation per second.
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