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hw_3_solu - ME 141A Intro to Nanotechnology Due HOMEWORK#3...

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ME 141A Intro to Nanotechnology Due: 2/23/2008 HOMEWORK #3 SOLUTIONS 4.10) Rank the following bonds from strongest to weakest and provide the bong energy: the bond between hydrogen and oxygen in a water molecule, the bond between sodium and chlride in the NaCl molecule, the bond between atoms in a metl, the van der Waals bond between adjacent atoms. NaCl= 8.3 x 10 -19 J; Oxygen-hydrogen in a water molecule = 7.6 x 10 -19 J; atoms in a metal 1.6 x 10 -19 to 4.8 x 10 -19 J; van der Waals between hydrogen atoms = -1.4 x 10 -22 J. 4.13) A given crystal structure (such as NaCl) can be represented as consisting of planes of atoms, as shown in Figure 4.25. A beam of x-rays can be reflected off of the crystal, where some of the beam penetrates through the atoms of the upper layer and strikes the atoms in the lower plane. A pair of incident x-rays from an x-ray source are reflected from the crystal as shown and into an x-ray detector. a) How much farther does the beam reflected from the lower plane travel from source to detector than the one reflected from the upper plane?
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