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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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Power`=N/t hv`
Energy of photon`=E=P/((N/t))=200/(4xx10^(20))=5xx10^(-19)`
`lambda=((6.62xx10^(34))xx(3xx10^(8)))/(5xx10^(-19))m=3.972A^(0)`
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NARAYNA-DUAL NATURE-LEVEL-II (H.W)
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