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absolute temperature absorbing power amplitude atom becomes black surface body calculated chemical change cinnabar conductor crests cubic centimetre diffraction grating direction disc displacement distance dotted line earth ebonite effect electric field electric waves electrified electromagnetic waves electrons emission emitted energy experiment fluorescence focus Fourier's fraction full radiator gases glass glow grating heat and light heat radiated heat waves Hertz incandescent lamp-black Langley's bolometer large number length light and heat light pressure lines of force magnetic field magnetic waves means measured mercury motion moving orbit oscillation particle pendulum perfectly perpendicular phosphorescence placed plane wave position prism produced quartz radiating power range of wave-lengths range of waves rays reflected refraction represent result rods screen shorter waves simple waves slits solid source of light space sparking spectra speed Sylvite tion transparent substance ultraviolet vessel visible spectrum wave theory wave-length white light zero