Energy and Frequency. Planck showed how the energy of a quantum of light is related is related to its frequency. He defined a constant, known as Planckâs constant, which, when multiplied by the frequency of a light quantum, gives its energy.
curiosity noun (INTEREST). B2 [U] an âeager âwish to âknow or âlearn about something: to âarouse/âexcite/âsatisfy someone's curiosity I'm âburning with curiosity-you must âtell me who âwon! She âdecided to âcall her ex-boyfriend out of curiosity.
Definition of curious. 1  1a archaic : made carefullyb obsolete : abstrusec archaic : precisely accurate. 2  2a : marked by desire to investigate and learn They were curious as to who won the game. 3  3 : exciting attention as strange, novel, or unexpected : odd a curious coincidence We were concerned about his curious behavior.