12.1 12. Structure and Properties of Atoms (text Ch 6)A. Wave-Particle Duality of Light •Light travels as an electromagnetic wave with a wavelength (λ). •The amplitude is the intensity (brightness) •The number of cycles that pass a given point per unit time is the frequency (υ). One Hertz (Hz) is one cycle per second. •The speed (c) at which light moves through space is a constant, 2.998 × 108m s−1. Therefore, c= υλ•Electromagnetic waves span a spectrum, but our eyes can only see around 400 – 700 nm. White light from the sun consists of all wavelengths between this range (and more).
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