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A metal with body centered cubic (bcc) structure show the first (i.e. smallest angle)
diffraction peak at a Bragg angle of 0 = 30°. The wavelength of X-ray used is 2.1 Å. The
volume of the PRIMITIVE unit cell of the metal is
(a) 26.2 (Å)³
(b) 13.1(Á)³
(c) 9.3 (Á)³
(d) 4.6 (Ấ)³

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