An x-ray photon of energy 3.20 × 10-15 j has what wavelength?

There is an inverse relationship between the energy and the wavelength of the photon as it is shown in the equation below,
                                  E = hc / λ
where E is energy, h is Planck's constant equal to 6.626 x 10^-34 J/s, c is the speed of light equal to 3 x 10^8 m/s, and λ is wavelength. Calculating for wavelength,
                    λ = (6.626 x 10^-34 J/s)(3 x 10^8 m/s)  / (3.20 x 10^-15 J)
                           λ = 6.2 x 10^-11 m

    5.5 n======    assuming that      we have      m = 0.145 kg    a = 38 m/s²therefore    5.51 n, but two significant figures.final answer: 5.5 n

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