Exposure to ultraviolet light is one method used to sterilize medical equipment, disinfect drinking water, and pasteurize

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Exposure to ultraviolet light is one method used to sterilize medical equipment, disinfect drinking water, and pasteurize fruit juices. Microorganisms are typically small enough that UV light can penetrate to the cell nucleus and damage their DNA molecule. If it requires a photon of energy 4.6 eV to damage a DNA molecule, what is the largest wavelength that can be used in UV sterilization?

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