Use the formula from Bragg’s Law to determine the distance of separation between the layers in the sample of copper.

The *Bragg's Law* defines the** relationship between the wavelength of the incident X-rays, angle of incidence and spacing between the crystal lattice planes of atoms**:

X-rays with a wavelength of 13.6 nm are allowed to diffract off a sample of copper. The first angle of constructive interference is seen at 25.25°. Determine the distance (in nm) of separation between layers in the sample of copper.

a. 31.9 nm

b. 63.76 nm

c. 15.94 nm

d. 18.42 nm

e. 9.21 nm

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