Question: 2. In lecture notes (p.5), we have discussed the single-beam design and the doublebeam design. (a.) Please try to compare the similarities and differences between

2. In lecture notes (p.5), we have discussed the single-beam design

2. In lecture notes (p.5), we have discussed the single-beam design and the doublebeam design. (a.) Please try to compare the similarities and differences between the single-beam . design and the double-beam design. (b.) "Chopper" is applied in the design of a double-beam instrument. Please explain. the purpose of the chopper and its operating principle. (c.) In the Figure of the double-beam design, there is a component called PMT (photomultiplier tubes), Please explain the purpose of the PMT and its operating principle

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