In Davisson and Germer experiment, target crystal is made up of?
Correct answer: B. Nickle
- A. Copper
- B. Nickle
- C. Aluminium
- D. Silver
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.
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Classical physics cannot explain blackbody radiation and related observations, leading to Planck’s quantum theory, in which energy is emitted or absorbed in discrete packets. Photons provide the particle model of light, with energy and momentum linked to frequency and wavelength, including the photoelectric effect and its threshold frequency.
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