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Engineering · Electrical Engineering
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3.3 An electromagnetic pulse is sent from an earth station to the moon, and the reflected pulse is received 2.56 s later. How far is the moon from the earth? (An electromagnetic pulse consists of a wide spectrum of electromagnetic waves at different frequencies.) 3.5 A helium-neon laser emits light at a wavelength 6.328 x 10 m in air. Calculate its fre- quency, period, and wave number

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