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A crystal is irradiated with x-rays with a wavelength of 0.120 nm. the atomic planes in the crystal are separated by 0.21 nm. at what angles of incidence with respect to the normal will the x-rays reflect from the crystal?

Respuesta :

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The angles of incidence with respect to the normal will the x-rays reflect from the crystal will be 16.60 degrees. 

Given: wavelength of X-rays, λ= 0.120 nm

Distance, d=0.21 nm

According to Bragg’s diffraction law: nλ = 2dsinθ

thus, 0.120 = 2*0.21sinθ

or θ = [tex] sin^{-1} [/tex] (0.120/2*0.21)

or θ = 16.60 degrees. 


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