Question

The distance between the interatomic lattice plane is $10Ă$. The maximum wavelength of X-rays which are diffracted by the crystal will be

• A. $10Ă$
• B. $20Ă$
• C. $30Ă$
• D. $40Ă$

Answer 1

The correct option is B

$20Ă$

Step-1: Given

Distance between the interatomic lattice plane is, $d=10Ă$

Step-2: Formula

The maximum wavelength of X-rays ${\lambda }_{max}=2\times d$

Step-3: Calculation for maximum wavelength of X-rays

$$\begin{gathered} {\lambda }_{max}=2\times d \\ \Rightarrow {\lambda }_{max}=2\times 10Ă \\ \Rightarrow {\lambda }_{max}=20Ă \end{gathered}$$

Hence, Option (B) is the correct option.