- AAluminum
- ✓Nickel
- CCobalt
- DZinc
The crystal used in the Davisson $–$ Germer experiment is nickel. A fine beam of electrons is made to fall on the surface of the nickel crystal. As a result, the electrons are scattered in all directions by the atoms of the crystal.
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$(A)$ The light ray enters air if $n _2= n _1$
$(B)$ The light ray is finally reflected back into the medium of refractive index $n_1$ if $n_2< n _1$
$(C)$ The light ray is finally reflected back into the medium of refractive index $n _1$ if $n _2> n _1$
$(D)$ The light ray is reflected back into the medium of refractive index $n_1$ if $n_2=1$
Reason : Maximum number of bright fringe on the screen is directly proportional to the wavelength of light used.
