$(25)($a$)(5)$What is the appropriate characterization technique for observation of

fractured fiber composite samples to evaluate fracture surface?

$($b$)(5)$Write two ADVANTAGES and two DISADVANTAGES of electron

diffraction over $x-$ray diffraction

$($s$)(5)$Describe the technique used for preparing ceramic samples for observation

under the TEM.

$($d$)(10)$What are the four types of excitations observed in the electron energy loss

spectra. What is the spectra useful for?