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A point source of \(100\mathrm{W}\) emits light with 5% efficiency. At a distance of \(5\mathrm{m}\) from the source, th…

Q1

A point source of \(100\mathrm{W}\) emits light with 5% efficiency. At a distance of \(5\mathrm{m}\) from the source, the intensity produced by the electric field component is:

a

\(\frac{1}{2\pi }\frac{\mathrm{W}}{{\mathrm{m}}^{2}}\)

b

\(\frac{1}{40\pi }\frac{W}{{m}^{2}}\)

c

\(\frac{1}{10\pi }\frac{W}{{m}^{2}}\)

d

\(\frac{1}{20\pi }\frac{W}{{m}^{2}}\)

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