A monochromatic source of light operating at 200 W emits 4×1020 photons per second. Find the wavelength of the light (in×10−7m)
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Solution
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We know that , Power = (Number of photons per second ) ×hCλ 200 = 4×1020×2×10−25λ ∴λ = 4×10−7 m
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