the ratio of energy of photons with wavelengths 200A and 4000A is
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Also, v=c/λ hence energy of a photon becomes hc/λ. This means that energy of a photon is inversely proportional to the wavelength. This means E¹/E²=λ²/λ¹ and this means that the ratio of the two given photons is equal to 4000/200=20.
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