The relationship between wavelength and energy of a photon is:

$\overline{){\mathbf{E}}{\mathbf{=}}\frac{\mathbf{h}\mathbf{c}}{\mathbf{\lambda}}}$

Therefore, wavelength, λ is expressed as:

$\overline{){\mathbf{\lambda}}{\mathbf{=}}\frac{\mathbf{h}\mathbf{c}}{\mathbf{E}}}$, where h is the Plank's constant and c is the speed of light in a vacuum.

What is the wavelength, in nm, of a photon with energy (a) 0.30 eV, (b) 3.0 eV and (c) 30 eV? For each, is this wavelength visible light, ultraviolet or infrared?

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