the energy of emitted electrons is found to be proportional to the frequency of radiation. This observation was first made by Philipp Lenard, who did initial work on the photoelectric effect.

Theoretical physicists have proposed a potential solution to one of the most puzzling problems in modern physics: the black hole singularity paradox. By modifying Einstein's theory of general ...

These are some of the best-performing stocks in the energy sector over the past month Yui Mok - PA Images/Getty Images Companies in the energy sector explore for and develop oil and gas products ...