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For a crystal, the angle of diffraction ...

For a crystal, the angle of diffraction (20) is `90^@` and the second order line has a d value of `2.28 A^@`. The wavelength (in `A^@`) of X-rays used for Bragg's diffraction is

A

`1.61Å`

B

`1.14Å`

C

`2.28Å`

D

`2.0Å`

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