Question
Crystal diffraction experiments can be performed using Xrays or electron accelerated through appropriate voltage. Which probe, an Xray photon or the electron, has greater energy? Take the wavelength of either probe equal to 1 Å, which is of the order of interatomic spacing in the crystal lattice. Mass of electron is .

None of these



diffcult
Solution
The energy of an Xray photon of wavelength is given by
.
.
Now, the kinetic of an electron of deBroglie wavelength is given by
Substituting the values, we get
= 150.6 eV.
Thus, for the same wavelength of 1 Å, an Xray photon has much greater energy that an electron. Therefore Xrays will penetrate to a greater depth into the crystal that the electrons.
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.
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