Share this entry

Share this page

Planck's constant

Line breaks: Planck's con|stant
Pronunciation: /plaŋks
 
/
(also Planck constant)

Definition of Planck's constant in English:

noun

Physics
A fundamental constant, equal to the energy of a quantum of electromagnetic radiation divided by its frequency, with a value of 6.626 × 10−34 joules.
Example sentences
  • The top three on most people's lists are the speed of light in a vacuum, Newton's gravitational constant, and Planck's constant, the foundation of quantum mechanics and the key to Heisenberg's infamous uncertainty principle.
  • Of course it may be that the speed of light and the charge on the electron and the gravitational constant and Planck's constant, and so on, will one day be explained as deriving from more basic realities.
  • A general expression for these reactions shows that the photon of light given off has an energy equal to Planck's constant times the frequency of the light emitted.

Definition of Planck's constant in:

Share this entry

Share this page

 

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day cumbersome
Pronunciation: ˈkʌmbəs(ə)m
adjective
large or heavy and therefore difficult to carry…