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The First order reflection (n = 1) from ...

The First order reflection (n = 1) from a crystal of the X-ray from a Copper anode tube (`lamda` = 1.54 Å) occurs at an angle of 45°. What is the distance between the set of plane causing the diffraction ?

A

0.1089 nm.

B

0.1089 m.

C

10.89 Å

D

`1.089 xx 10^(-9) m.`

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