Question

Interplanar spacing between parallel planes can be determined by:

• A. Scanning Electron Microscope
• B. Transmission Electron Microscope
• C. Spectrophotometer
• D. Thermogravimetric Analyser

Hint:

\textbf{TEM} allows measurement of interplanar spacing by analyzing diffraction patterns using Bragg's law.

Answer 1

The Correct Option is B

Step 1: Understanding Interplanar Spacing
Interplanar spacing refers to the distance between parallel atomic planes in a crystal lattice. It is a critical structural parameter used in materials science and solid-state physics. Step 2: Why Use a Transmission Electron Microscope (TEM)?
The Transmission Electron Microscope (TEM) can provide high-resolution images at the atomic scale due to: - Very short electron wavelengths, - Capability to produce electron diffraction patterns, which can be analyzed using Bragg's Law: \[ n\lambda = 2d\sin\theta \] where \( d \) is the interplanar spacing. Step 3: Elimination of Other Instruments
- Scanning Electron Microscope (SEM): Provides surface topology, not interplanar distances.
- Spectrophotometer: Measures light absorption, used in chemical analysis.
- Thermogravimetric Analyser (TGA): Measures mass change with temperature; unrelated to crystal structure. Conclusion: TEM is the appropriate tool for measuring interplanar spacing due to its diffraction and atomic resolution capabilities.