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X-RAYS
X-rays, What Are They? 6:7 X-rays, What Are They? 7:7  »
     

X-rays, What Are They?

More About the Bragg Formula

     

X-rays scattered from different layers of atoms can interfere with each other. The interference depends on the wavelength of the X-ray and on the distance between the atom layers. An X-ray with well-known wavelength can be used to explore the structure of the crystal. For a well-known crystal, the X-ray properties can be examined.

 
  Crystal planes, in NaCl, ordinary salt. Other planes are also possible.

X-ray scattering from three crystal planes, separated by the distance d. For constructive interference in a direction  the path difference must be an even number of wavelengths.

Related Laureates

 The Nobel Prize in Physics 1915 - Sir William Henry Bragg  »  The Nobel Prize in Physics 1915 - William Lawrence Bragg  »  


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