In the Davison and Germer experiment of wave nature of electrons, the velocity of electronsemitted from the electron gun can be increased between anode and heated filament by
Correct answer: A. Increasing the applied voltage.
- A. Increasing the applied voltage.
- B. Decreasing the applied voltage.
- C. Increasing the amount of electric current.
- D. Decreasing the amount of electric current.
Explanation
In the Davison and Germer experiment, the velocity of electrons emitted from the electron gun is directly proportional to their kinetic energy, which is determined by the applied voltage. By increasing the voltage, you increase the energy provided to the electrons, thus increasing their velocity. Decreasing the voltage would have the opposite effect, reducing the velocity. The amount of electric current affects the quantity of electrons but not their velocity.
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About Quantum Theory and Radiation
Quantum theory treats electromagnetic radiation as packets of energy called photons, with energy proportional to frequency through E equals hf. The topic covers Planck's hypothesis, photon momentum, the photoelectric effect, threshold frequency, work function and wave particle duality, distinguishing quantised energy exchange from classical continuous radiation.
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