Exposure to a sufficient quantity of ultraviolet will redden the skin, producing

Question

Exposure to a sufficient quantity of ultraviolet will redden the skin, producing erythema - a sunburn. The amount of exposure necessary to produce this reddening depends on the wavelength. For a 1.0 { cm}^{2} patch of skin, 3.7 { mJ} of ultraviolet light at a wavelength of 254 { nm} will produce reddening; at 300 {nm} wavelength, 13 { mJ} are required.

What is the photon energy corresponding to each of these wavelengths? In J

How many total photons does each of these exposures correspond to? In Photons

Explanation / Answer

4.7×1015,2.0×1016 photons

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