# Crystal diffraction experiments can be performed using X – rays, or electrons accelerated through appropriate voltage. Which probe has greater energy? (Take wavelength of probe = $1 A^{\circ}$ )
$\begin {array} {1 1} (a)\;X-ray\: probe & \quad (b)\;Electron\: probe \\ (c)\;Both\: have\: equal\: energies & \quad (d)\;Can’t \: be\: determined \end {array}$