Electrons are used to determine the structure of crystal surfaces. To have diffr

Question

Electrons are used to determine the structure of crystal surfaces. To have diffraction, the wavelength of the electrons should be on the order of the lattice constant, which is typically 0.3 nm. What energy do such electrons have, expressed in electron-volts and joules? Electrons are used to determine the structure of crystal surfaces. To have diffraction, the wavelength of the electrons should be on the order of the lattice constant, which is typically 0.3 nm. What energy do such electrons have, expressed in electron-volts and joules?

Explanation / Answer

solution:

energy[E] =hc/l where l =wavelength =.3nm =.3*10^-9

   h =6.62*10^-34 ,c =3*10^8 and 1ev =1.6*10^-19J

after solving

   E =6.62*10^-16 J or 4.13*10^3 ev ANS

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