Determine the energy in an x-ray photon with a wavelength of 75. pm. (h=6.626x10-34J*s)

Answer 1

Hi Kristen,

Here the wavelength is 75. pm, which you can convert to meters, since 1 m = 1 x 10¹² pm. That means the wavelength is 7.5 x 10^-11 m. Now you can use the equation c = wavelength x frequency to find the wavelength: 3.0 x 10⁸ m/s = 7.5 x 10^-11 m * frequency. So frequency = 4.0 x 10 18 s^-1. Finally, you can use the equation E = h x frequency to solve for the energy: E = (6.626 x 10^-34 J*s) x (4.0 x 10 18 s^-1)

= 2.65 x 10 ^-15 J. Since your original wavelength value only has two significant figures, you should report your answer as 2.7 x 10^-15 J.

Kristen, if you every want help with chemistry, I am here for you.