The E = mC ^ 2, if the optical signal from the input terminal into a measuring instrument (=) is the optical information in the band 20-20000 Hz, the test subject can be measured to a different wind speed or standard speed of sound (331.7 m / s ); if the instrument is to enter a high frequency band of the optical information, the experimenter measured is an electromagnetic wave (velocity calculated value 300,000 km / sec); if the instrument is to enter a high-speed frequency band 400-760 the optical information-nm-band, the experimenter measured velocity is the projection (300,000 km / sec).
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