Velocity of Wireless Waves

The development of wireless and the technique of radar have also enabled the measurement of velocity of light accurately. It has been found that the velocity of wireless waves and the velocity of light in vacuum are the same. Thus, new methods for the measurement of velocity of wireless waves have been devised. One method depends upon the use of micro-waves and the measurement of wavelength and resonant frequency of a hollow metal cylinder. This method is similar to the common laboratory method for measuring the velocity of sound.

In England experiments were performed by Eseen and Gordon Smith, while in America by Bol. Aslakson used radar method that consists in the direct measurement of the time of transit of a signal over a known distance in open air. Froome used micro-wave interferometer method.

More recently many scientists have used the principle of microwave interferometer and ultrasonic modulator to determine the velocity of light. In 1967, Karolus and Helmbergh used He-Ne gas laser as a source of light and obtained a value of

C = 299, 792.5 ± 0.15 km/s.

Simkin and others (1967) used microwave interferometer method and obtained a value of

C = 299, 792.56 ± 0.11 km/s

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