Warm objects emit electromagnetic radiation in the infra-red regions. Heat lamps employ this principle to generate infra-red radiation. Water absorbs infra-red radiation with wavelengths near 2.80 micrometer. Suppose this radiation is absorbed by the water and converted to heat. A 1.00 L sample of water absorbs infra-red radiation, and its temperature increases from 20.0 Celsius to 30.0 Celsius degree. How many photons of this radiation are used to heat the water?
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