Question

If a strong diffraction peak is observed when electrons are incident at an angle `$i$' from the normal to the crystal planes with distance `d' between them (see figure), de Broglie wavelength ${\lambda }_{dB}$ of electrons can be calculated by the relationship $(n$ is an integer):

• A. $2d$ sin i $=n{\lambda }_{dB}$
• B. $\text{d}$ cos i $=n{\lambda }_{dB}$
• C. $d$ sin i $=n{\lambda }_{dB}$
• D. $2\text{d}$ cos i $=n{\lambda }_{dB}$

Answer 1

The correct option is D $2\text{d}$ cos i $=n{\lambda }_{dB}$