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An argon laser emits blue light with a wavelength of 488.0nm. How many photon are emitted by this laser in 2.00 sec,operating a power of 515 milliwatts?(one watt = 1J$S^{-1}$)


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Power = 15 milliwatts
=0.515 watt=0.515 J/S
$\therefore Energy = 0.515\times2.00$
1.030J obtained in 2 second
E = NhV = $\large\frac{Nhc}{\lambda}$
N = $\large\frac{E\lambda}{hc}$
$=2.5286\times10^{18}$ photons
Hence anwer is (c)
answered Feb 6, 2014 by sharmaaparna1

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