91影视

Diffraction is a phenomena in which the interference or the bending of waves occurs around the corners of the opening or obstacle through or on which it strikes.

The diffraction formula is following,

$$\begin{gathered} \mathrm{苍位}=2\mathrm{诲蝉颈苍胃} \\ \mathrm{位}=\text{wavelength} \\ \mathrm{d}=\text{spacing} \\ \mathrm{胃}=\text{bragg angle} \\ \mathrm{n}=\text{order of diffraction} \end{gathered}$$

The spacing between reflecting plans is, $d=\text{0.94}鈥�\text{nm}$.

The bragg angle is, $胃=2.00掳$.

As the graph is running from 0 degree to 2 degrees the shortest wavelength wave is present at around the 0.75 degrees.

So putting all the values we will get shortest wavelength

${位}_1=2d\sin {胃}_1$

Substitute all the value in the above equation.

$$\begin{gathered} {位}_1=2\left(\text{0.94}鈥�\text{nm}\right)\sin 0.75掳 \\ {位}_1=0.025鈥�\text{nm} \\ {位}_1=25鈥�\text{pm} \end{gathered}$$

As the graph is running from 0 degree to 2 degrees the longest wavelength wave is present at around the 1.15 degrees.

So putting all the values we will get longest wavelength

${位}_2=2d\sin {胃}_2$

Substitute all the value in the above equation.

$$\begin{gathered} {位}_2=2\left(\text{0.94}鈥�\text{nm}\right)\sin 1.15掳 \\ {位}_2=0.038鈥�\text{nm} \\ {位}_2=38鈥�\text{pm} \end{gathered}$$

Hence the longest wavelength is,$38鈥�\text{pm}$ .