Q. The filament current in the electron gun of a coolidge tube is increased while the potential difference used to accelerate the electrons is decreased. As a result, in the emitted radiation
A) The intensity increases while the minimum wavelength decreases
B) The intensity decreases while the minimum wavelength increases
C) The intensity as well as the minimum wavelength increases
D) The intensity as well as the minimum wavelength decreases
Explanation
(c) When filament current is increased, more electrons are emitted from electron gun. Due to which the intensity of electrons increases.
As $\lambda_{\min} = \frac{hc}{eV},$ so as $V$ decreases, $\ \lambda_{\min}$ increases.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.