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A certain laser transition emits $6.37\times10^{15}$ quants per second per square meter. Calculate the power out put in joule per square metre per second. Given $\lambda$ = 632.8 nm.


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Energy falling per square meter per second = No. of quanta falling/$m^2/sec\times$ energy of one quanta
$= 6.37\times10^{15}\times\large\frac{hc}{\lambda}$
$=2\times10^{-3} J/m^2/sec$
Hence answer is (a)
answered Feb 4, 2014 by sharmaaparna1

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