## Question

The first order reflection of a beam of X – rays of wavelength from the (210) plane of a crystal of the simple cubic type, occurs at an angle of 11.29^{0}, the length of the unit cell is

### Solution

8.794 × 10^{-8} cm

1 × (1.54 × 10^{-8}) = 2 × d × sin 11.29

*d* = 3.933 × 10^{-8} cm

= 8.794 × 10^{-8} cm

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