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The energy of a photon of light with wavelength 5000 Å is approximately 2.5 eV. This way the energy of an X-ray photon with wavelength 1Å would be (a) 2.5/5000 eV (b) 2.5/50002 eV(c) 2.5×5000 eV (d) 2.5×50002 eV
(c) E∝1λ⇒2.5E'=15000⇒E'=2.5×5000 eV