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Explore the production of electromagnetic waves, including the relationship between electric and magnetic fields, the alternating direction of fields, and their phase. Discover how EM waves are generated by accelerating electric charges and learn about the speed of EM waves in the electromagnetic spectrum. Calculate the wavelengths of different EM waves, such as a 60-Hz EM wave, a 93.3 MHz FM radio wave, and a beam of visible red light from a laser at a frequency of 4.74x10^14 Hz.
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-the electric and magnetic fields at any point are perpendicular to each other and to direction of motion; • fields alternate in direction from point to point; • the electric and magnetic fields are “in phase”.
Example • Calculate the wavelength: • Of a 60-Hz EM wave; • Of a 93.3 MHz FM radio wave; • Of a beam of visible red light from a laser at frequency 4.74x1014 Hz.