What is the wavelength (angstroms) of a photon that has an energy of 4.38 x 10-18 j?

The relationship between energy and frequency of a photon is given by

where E is the energy, h is the Planck constant and f is the photon frequency. By re-arranging the equation and using the photon energy, we can calculate its frequency:


Then we know that the photon travels at speed of light, c, so we can find its wavelength by using


And since 1 A (angstrom) corresponds to , the wavelength expressed in angstroms is

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