Directions: are based on the following paragraph. |
Wave property of electrons implies that they will show diffraction effects. Davisson and Germer demonstrated this by diffracting electrons from crystals. The law governing the diffraction from a crystal is obtained by requiring that electron waves reflected from the planes of atoms in a crystal interfere constructively (see figure). |
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) [AIEEE 2008] |
A) \[2\,d\sin i=n{{\lambda }_{dB}}\]
B) \[d\cos i=n{{\lambda }_{dB}}\]
C) \[d\sin i=n{{\lambda }_{dB}}\]
D) \[2d\cos i=n{{\lambda }_{dB}}\]
Correct Answer: D
Solution :
[d] For strong peak, path differenceYou need to login to perform this action.
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