Which of the following is used in the Davisson – Germer experiment?Group of answer choicesSingle slitDouble slitElectron microscopeElectron gun

To understand the Davisson-Germer experiment, let's discuss the key elements involved:

1. Experiment Overview: The Davisson-Germer experiment, conducted in the 1920s, was crucial in demonstrating the wave nature of electrons. It involved the scattering of electrons off a crystalline nickel target.

2. Choice of Instruments:

   • The experiment utilized an electron gun to emit a beam of electrons directed towards the nickel target. The electrons then scattered off the atoms in the target, providing evidence of wave-like properties through diffraction patterns.

3. Other Options:

   • A single slit and double slit method relates more to classical wave experiments, such as Young's interference experiment, which is not the primary focus in Davisson-Germer.
   • An electron microscope is an application using electron waves for imaging, but it is not directly used in this experimental setup.

Conclusion

The correct answer to the question about what is used in the Davisson-Germer experiment is Electron gun. This instrument was essential in demonstrating the wave-particle duality of electrons, as evidenced by the diffraction patterns observed.