# Which of these does Planck's constant depend on?

##### 1 Answer

Aug 18, 2017

Which what? Well, Planck's constant is... constant. So it should not depend on any variable. It is:

#h = 6.62607004 xx 10^(-34) "J"cdot"s"#

Common equations where you would see Planck's constant are:

#E_"photon" = hnu = (hc)/lambda# ,#" "# **(Planck-Einstein Relation)**

the energy of a single photon based on its frequency

#nu# .#c = 2.99792458 xx 10^(8) "m/s"# is the speed of light and#lambda# is its wavelength in#"m"# .

#lambda = h/p = h/(mv)# ,#" "# **(de Broglie Relation)**

the wavelength of a particle with a mass

#m# and velocity#v# .#p = mv# is its linear momentum.

#DeltaxDeltap >= ℏ/2# ,#" "# **(Heisenberg Uncertainty Principle)**

where

#ℏ = h//2pi# is the reduced Planck's constant.