What is Plank's theory? What is Plank's constant h ?

Question

Sorry for bad spelling. It is Planck's theory. Planck's constant.

Answer 1

Planck's constant, , was proposed in reference to the problem of black-body radiation. The underlying assumption to Planck's law of black body radiation was that the electromagnetic radiation emitted by a black body could be modeled as a set of harmonic oscillators with quantized energy of the form:

E = hv
E is energy
h is planck's constant
v is Frequency
This model proved extremely accurate, but it provided an intellectual stumbling block for theoreticians who did not understand where the quantization of energy arose — Planck himself only considered it "a purely formal assumption". This line of questioning helped lead to the formation of quantum mechanics.

Planck's constant has units of energy multiplied by time, which are the units of action (J·s). These units may also be written as momentum times distance (N·m·s), which are also the units of angular momentum. However, often the unit of choice is eV·s, because of the small energies that are affected by the uncertainty principle.

The value of Planck's constant is:
h = 6.626 x 10^(-34) J.s = 4.135 x 10^(-15)eV.s

Answer 2

But actually his name is spelled "Planck", I'm pretty sure.