Mechanical waves, Caused by a disturbance or vibration in matter, Medium, Matter that waves are traveling through, Magnetic field, An area of electrical force surrounding a positively or negatively charged particle., Electromagnetic waves, They do not require a medium to propagate., James Clerk Maxwell, He developed a scientific theory to explain electromagnetic waves., Heinrich Hertz, The unit of frequency of a radio wave was named after him., Photon, A packet of energy that is both a particle and a wave.

EM WAVES

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