Atomic StructureHard
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?
Options
A.1.2 × 109
B.1.2 × 1027
C.1.2 × 1018
D.1.2 × 1015
Solution
$E = \frac{nhc}{\lambda} \Rightarrow 0.36 = \frac{n \times 6.626 \times 10^{- 34} \times 3 \times 10^{8}}{6.626 \times 10^{- 9}}$
$\therefore n = 1.2 \times 10^{18}$
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