RevQ+Week-4+and+5+KEYS.pdf

# What is the average wavelength for cu k α line 11

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overlapped each other. What is the average wavelength for Cu-K α line? (11) Draw the x-ray spectrum generated from Mo at 30 KeV electrons. (7) Similarly, wavelength for Mo-K α 1 and –K α 2 lines are so close each other. What is the average wavelength for Mo-K α line? Questions (8)-(12) were conducted in the class. See course pack, or see below. (13) What is the trend of increasing the atomic number on the mass absorption coefficient? The mass absorption coefficient trend follows a Z 3 relationship as atomic number increases, but at certain atomic numbers, there is a sudden drop in the mass absorption coefficient after which it increases as Z 3 , and so on. (14) Why are x-ray filters used? X-ray diffraction experiments require monochromatic radiation, so by using an x-ray filter, you are able to block out undesirable wavelengths of light.

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(15) If Cu-K β ray passes though a 50 μm Ni filter, based upon the data in appendix 8, please calculate I/I o for Cu-K β ray. x o e I I μ = ; for Cu-K β ray 1 3 2 7 . 2519 / 91 . 8 / 8 . 282 = × = = cm cm g g cm ρ ρ μ μ 6 10 50 * 7 . 2519 10 38 . 3 / 4 × × = = e I I o (16) If one wants to filter out the K β from the K
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