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A monochromatic source of light operating at 198 W emits 4×1020 photons per second. Find the wavelength of light in nm.(Take h=6.6×10−34 Js)

Answer» A monochromatic source of light operating at 198 W emits 4×1020 photons per second. Find the wavelength of light in nm.(Take h=6.6×1034 Js)


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