List of top Physics Questions on Atoms and Nuclei asked in COMEDK UGET

What is the kinetic energy of the electron in the \( n \)th level, moving in a plane under the influence of a magnetic field \( B \)? \([ m\text{ - mass of electron},\; h\text{ - Planck's constant},\; e\text{ - electronic charge}]\)

To get 300 MW electric power for half an hour, how much mass is to be completely converted into energy?