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Unit 2 – Nature of Light - Class 11 Chemistry Online Notes Wave Nature of Light The wave properties of light (electromagnetic radiation) are described in terms of the following parameters: Frequency (ν, spell as mu, in Greek):  The frequency of a wave is the number of cycles it undergoes per second. Its unit is 1/second (sec -1 , it is also called  Hertz, Hz ) Wavelength (λ, termed as lambda in Greek):  The wavelength is the distance between any points on the wave and the corresponding point on the next crest or trough of the wave. It is the distance the wave travels during one cycle. The units of wavelength are meters (m), for very short distances it is nanometers (10 -9 m), picometers (10 -12 m) or non-SI unit is Angstrom (Å, 10 -10 m). Speed:  The speed of the wave is the distance it moves per unit time i.e.  meters per second (m/s) . It is the product of frequency (cycles per second) and wavelength (meters per cycle). In a vacuum, the electromagnetic radiations move