Atomic StructureHard

Question

A certain laser transition emits 6.0 × 1015 quanta per second per square metre of λ = 662.6 nm. What is the power output in joule per second per square metre?

Options

A.1.8 × 10–3
B.6.626 × 10–4
C.1.8 × 103
D.6.626 × 10–12

Solution

$p = \frac{E}{t} = \frac{n.hc}{\lambda} = \frac{6 \times 10^{15} \times 6.626 \times 10^{- 34} \times 3 \times 10^{8}}{1 \times 662.6 \times 10^{- 9}} = 1.8 \times 10^{- 3}\text{ J/s-}\text{m}^{2}$

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