# Planck’s constant

Planck's constant is a physical constant that is used to describe the behavior of subatomic particles. It is named after German physicist Max Planck, who first proposed it in 1900.

Planck's constant is important in many areas of physics, including quantum mechanics and quantum field theory. It is also used in the study of black body radiation, which is radiation emitted by a body that is in thermal equilibrium with its surroundings.

Planck's constant has the value of 6.626070040 x 10-34 joule-seconds. This value was first measured by Planck in 1901. What is Planck's constant value? Planck's constant is a physical constant that is essential to several areas of physics, including quantum mechanics and quantum electrodynamics. Its value is 6.626070040(81)×10−34 joule⋅seconds, or 6.626070040(81)×10−34 m2⋅kg/s. Why is it called Planck's constant? The Planck constant is named after Max Planck, who was the first to propose that the amount of energy carried by a photon is proportional to its frequency. The constant of proportionality is now known as Planck's constant.

##### What is Planck's formula used for?

Planck's formula is used to describe the emission spectrum of a black body in thermal equilibrium. The spectrum is continuous, but the intensity of the radiation decreases as the frequency of the radiation increases. The formula is named after German physicist Max Planck, who derived it in 1900.

The formula is as follows:

I(ν,T)=2hν3/c2(e^(hν/kT)-1)

where:

I(ν,T) is the spectral radiance of the black body at temperature T and frequency ν

h is Planck's constant

ν is the frequency of the radiation

c is the speed of light in a vacuum

k is Boltzmann's constant

T is the temperature of the black body in Kelvin

The formula is used in a variety of fields, including astronomy and astrophysics, to determine the temperature of objects that emit black body radiation. What is dimension of Planck's constant? Planck's constant is a physical constant that is associated with the quantum mechanical behavior of matter and energy. The dimension of Planck's constant is energy divided by frequency. Where is Planck's constant used? Planck's constant is used in a variety of fields, including quantum mechanics, quantum electrodynamics, and quantum field theory. It also plays a role in the physics of black holes and the early universe.