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1. |
An X ray having a wavelength of 1.67 x 10-10 undergoes the first-order reflection. What is the glancing angle ( ) if the spacing between the two planes is 6 x 10-10? |
A. | 6.25 |
B. | 8.99 |
C. | 7 |
D. | 8 |
Answer» E. | |