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A monochromatic source of light operatio...

A monochromatic source of light operation at 200 W emits `4xx10^(20)` photons per second. Find the wavelength of the light `"(in" 10^(-7)m`).

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The correct Answer is:
4
power = `p = (N)/(t)hv`
`therefore E = (12400)/(lambda)eV`
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