A ruby laser produces radiations of wavelength 662.6 nm in pulses whose duration are 1.0 × 10–9 s. I

Question

A ruby laser produces radiations of wavelength 662.6 nm in pulses whose duration are 1.0 × 10–9 s. If the laser produces 0.36 J of energy per pulse, then how many photons are produced in each pulse?

Accepted Answer

$E = \frac{nhc}{\lambda} \Rightarrow 0.36 = \frac{n 	imes 6.626 	imes 10^{- 34} 	imes 3 	imes 10^{8}}{6.626 	imes 10^{- 9}}$$	herefore n = 1.2 	imes 10^{18}$

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