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Thermodynamics

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Electromagnetic Spectrum

Visible spectrum includes those wavelengths which can stimulate the sense of sight. But there is no basic difference between light waves and the electromagnetic waves produced by electrical oscillating circuit. The term electromagnetic spectrum is used for the range of wavelengths from 10⁴ metres to 1 Å (10^-8 cm). There is in fact no limit to the production of electromagnetic waves of very long wavelengths. The frequency of an alternating current generator can be made as low as possible by decreasing the speed of the generator. The wavelength of waves transmitted by a 50 hertz transmission line is 6 × 10⁸ cm. Waves of shorter wavelength can be produced by electrical oscillators. X-rays and gamma rays represent the waves of very short lengths.

It is interesting to note that the visible range of the spectrum comprises only a small range of the electromagnetic spectrum extending approximately from 4000 Å in the extreme violet region to 8000 Å in the extreme red. Beyond the violet region of the visible spectrum is the ultraviolet, X-rays and –rays. Beyond the red end the visible spectrum are the infra-red, short radio waves and radio broadcast waves.