State different units used for wavelength of electromagnetic waves.

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1. The SI unit of wavelength of electromagnetic waves is metre (m).

2. Small wavelengths are represented by micrometre (µm), angstrom (Å), nanometre (nm) etc.

[Note: l A = 1010 m = 10-8 cm, 1 µm = 10-6 m, 1 nm = 10-9 m.]

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