In Davisson and Germer experiment, target crystal is made up of?

Explanation

Option B is correct.Davisson and Germer showed that electrons are diffracted from nickle crystal in exacty same manner as X-rays. The target crystal in the Davisson and Germer experiment was made of nickel. The Davisson-Germer experiment was an experiment that demonstrated the wave nature of electrons by showing that they could be diffracted by crystals. The electrons were accelerated through a potential difference of 54 volts, giving them a de Broglie wavelength of 1.23 × 10⁻¹⁰ m. When the electrons were directed at a nickel crystal, they were diffracted in a way that was consistent with their wave nature. The choice of nickel was not arbitrary. Nickel has a face-centered cubic (FCC) crystal structure, which is a good lattice for diffraction. The FCC crystal structure has a regular arrangement of atoms, which provides a regular spacing for the electrons to diffract.