Question
Electromagnetic Theory Question on Wavelength and Frequency
The X-ray diffraction pattern of a monatomic cubic crystal with rigid spherical atoms of radius 1.56 Å shows several Bragg reflections of which the reflection appearing at the lowest 2𝜃 value is from (111) plane. If the wavelength of X-ray used is 0.78 Å, the Bragg angle (in 2𝜃, rounded off to one decimal place) corresponding to this reflection and the crystal structure, respectively, are
A
21.6° and body centered cubic
B
17.6° and face centered cubic
C
10.8° and body centered cubic
D
8.8° and face centered cubic
Answer
17.6° and face centered cubic
Explanation
Solution
The correct option is (B) :17.6° and face centered cubic