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  • A 100W sodium lamp radiates energy uniformly in all directions.  At what rate are the photons delivered to the sphere?

Q: 11.7 (b)  A 100W sodium lamp radiates energy uniformly in all directions. The lamp is located at the centre of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is 589\hspace{1mm}nm. At what rate are the photons delivered to the sphere?

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Power of the sodium lamp=100W

The rate at which photons are delivered to the sphere is given by

\\R=\frac{P}{E}\\ R=\frac{100}{3.37\times 10^{-19}}\\ R=2.967\times 10^{20}\ s^{-1}

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