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An X-ray beam of λ = 1.54 Å is propagating in free space. If this beam...

An X-ray beam of λ = 1.54 Å is propagating in free space. If this beam has an intensity of 100 W/cm2, then how many photons are moving across unit area per unit time?

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Answer #1

The energy of a single photon of wavelength is

The intensity is the energy passing per unit area per unit time. The number of photons that should move across unit area in unit time to make a beam of intensity is

Using 1cm=0.01m we get (1cm)²=10-4m² we get

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