Radiowaves - The EM wave with the longest wavelength, Gamma - The EM wave with the highest frequency, Frequency is - Waves per second (Hertz), Wavelength is - Length per wave (meters), X rays - Penetrate flesh, absorbed by bones, Visible light - The only part of the EM spectrum we can detect with our eyes, Wave speed = - Frequency x wavelength, Time period - The time for one wave (seconds), Transverse - All EM waves are, 3 x 108 m/s - The speed of EM wave in a vacuum , Amplitude - Maximum displacement of a wave from its undisturbed position, Ionising radiation - High energy waves, can cause DNA mutation,

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