EMR keywords (i.e., keywords relevant to the electromagnetic radiation (EMR)): cycle per second = 1/s = hertz (Hz), electromagnetic radiation (EMR), electromagnetic spectrum, frequency f = 1/p, Heinrich Hertz (1857--1894), hertz (Hz) = 1/s = cycle per second, inverse centimeters (cm**(-1), James Clerk Maxwell (1831--1879), period p = 1/f, photon energy E = hf = hc/λ = 1.2398419739(75) eV-μ/λ_μ, Planck's constant h = 6.62607015*10**(-34) J-s = 4.135667696 ... *10**(-15) eV-s (exact values; see NIST: Fundamental Physical Constants --- Complete Listing), polarization (unpolarized light), transverse waves, vacuum light speed c = 2.99792458*10**8 m/s ≅ 3*10**8 m/s ≅ 1 ft/ns, wavenumber k = 1/λ (conventionally measured in inverse centimeters (cm**(-1)), waves, etc.
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