Value Of hc

In physics, hc is a physical constant. Where h is Planck constant. It is the physical constant that relates the energy carried by a single photon to its corresponding frequency. The velocity of light in the vacuum is represented by c. Here h and c are constant, hence they are combined to give the value of hc. The value os this physical constant is expressed using eVm or Jm.

hc value

The value of hc has got prime importance in quantum mechanics. The individual values are taken the product to give hc value. The value of hc in eV and the values of hc in joules are given below-

Value of hc In Joules hc = 1.98644568×10-25 J.m
Value of hc In Meter-Kilogram-Second(MKS) units hc = 1.23984193×10-6 eV.m
Value of hc in terms of Ep.lp 2 pi


The value of hc is used in various applications in various forms that include Planck’s equation. The list below gives a brief insight into the application of value of hc-

  • In Black body radiation, the spectral radiance is expressed per wavelength given by-
    \(B_{\lambda }\left ( \lambda ,T \right )=\frac{2hc ^{2}}{\lambda ^{5}}\frac{1}{e^{\frac{hc} {\lambda k_{B}T}}-1}\)
  • In atomic structure, Energy of nth orbit is given by-
    \(E_{n}=-\frac{hc_{0}R_{\infty }}{n^{2}}\)

Hope the value of hc value along with the SI unit is clear to you now.

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