An x-ray has a wavelength of 4.40 Å. Calculate the energy (in J) of one photon of this radiation. Enter your answer in scientific notation.

Answer 1

E = energy in J

h = Plank's constant = 6.626x10-34 J-s

ν = frequency in s^-1

λ = wavelength in m = 4.40 Aº x 1x10^-10 m / Aº = 4.40x10^-10 m

c = speed of light ~ 3x10⁸ m/s

c = λν

E = hν

E = hc/λ = (6.626x10^-34 J-s)(3x10⁸ m/s) / 4.40x10^-10 m

E = 4.52x10^-16 J