Calculate frequency and wave-number of yellow radiation having wavelength 5800Å.

Wavelength of light = 5800×10<sup>-10</sup> m

Frequency = C/wavelength = 3×10<sup>8</sup>/5800×10<sup>-10</sup> = 0.05×10<sup>16</sup>

Wave number is the reciprocal of wavelength wave number = 1/wavelength = 0.017×10<sup>8</sup> m<sup>-1</sup>

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