Q. In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by
A) Decreasing the potential difference between the anode and filament
B) Increasing the potential difference between the anode and filament
C) Increasing the filament current
D) Decreasing the filament current
Explanation
[Solution from source] The electrons gain kinetic energy eV from the accelerating potential difference between filament and anode, so increasing that potential difference increases their speed. Filament current only changes how many electrons are emitted, not their speed. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.