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Planck's constant: explanation


There Planck's constant is that lowercase letter "h" that we can find in some Physics formula and is linked to the quantization of the quantities that we are going to investigate when we study matter at the microscopic level. We are therefore talking about electrons, protons, neutrons and photons, about Physics, a matter that also includes the study ofElectromagnetism and of Coulomb's law

Planck's constant: explanation

If a constant may seem useless, because it is constant, it is not. Indeed, in general the constants play a crucial role. In this case al Planck's constant allows the quantization of quantities such as energy, momentum and angular momentum. When it was discovered, the quantum mechanics has been able to evolve like never before and is today one of the fundamental constants to define other constants such as that of fine structure.

Planck's constant: definition

Indicated with h, the Planck constant it is also called the quantum of action and represents the minimum possible action. The mere fact that it exists is a sign that energy and fundamental physical quantities linked to it are not continuous but quantized, that is, they can only assume multiple values ​​of the constant itself.

Planck's constant: unit of measurement

It serves for quantify the energies, those that are not continuous but that can only assume certain values, so this constant has the dimensions of an energy for a time. In the system of units of measurement of atomic units it composes the unit of measurement of the angular momentum.

Planck's constant: formula

The constant name is in honor of Max Planck who introduced it back in 1900 by studying the spectrum of black body radiation. We do not find it only in that area but in many others and more often accompanied by the Pgreco version "Crossed out" which has the value of "h / 2Pgreco", called reduced Planck constant o Dirac constant.

Planck's constant and the uncertainty principle

One of the areas in which we find the Planck's constant is the one where the uncertainty principle reigns, that is when we go to study the accuracy limit that exists when we go to determine values ​​of pairs of variables such as Energy-Time and Position-Impulse.

The Heisenberg uncertainty principle, studied in quantum mechanics, delves into the limits in the knowledge and measurement of the values ​​of conjugated or incompatible physical quantities in a physical system.

It was obviously to state it Werner Karl Heisenberg in 1927 but then many experiments followed which confirmed the need to develop this principle, which has now become a key concept of quantum mechanics and which in his time was a profound break with respect to laws of classical mechanics.

Planck constant and Max Planck

Exactly in 1900 the scientist Planck started making history by claiming that the exchanges of energy in the phenomena of emission and absorption of electromagnetic radiations occurred in a discrete form instead of continuing.

By denying the classical electromagnetic theory he immediately made enemies but admirers and followers also arrived and already in 1901 Planck had developed an alternative quantum hypothesis to quantum theory with atoms that absorb and emit radiation for quanta. In 1918 this very theory made him win the Nobel Prize in Physics, another recognition won by Planck was, in 1929, the Copley Medal.

Plank and fitness

Curious to find the name of the constant, without “c”, and of the scholar who conceived it, in the field of fitness. However, this is in effect the name of a basic exercise to train the stabilizing muscles of the central part of the body. We are therefore talking about the vertebral column but also of the pelvis and of the connected part, of the lower limbs. It is natural to investigate whether there are any links between the constant of physics and exercise for physicists.

With the movements of the Plank you go to stimulate various muscles, in particular the abdominal muscles and the hip flexors. To perform the Plank exercise, you lie on the ground prone, with your elbows resting, your arms flexed at 90 degrees with respect to the torso, and your legs stretched out half apart.

At this point all that remains is keep the body position aligned going to contract the muscles involved, but pay attention to how you can compensate this effort with other muscles because it is important that they are not damaged or placed under stress.

There are many variations of the exercise, in spite of Planck's constant, including the side plank, but let the fitness enthusiasts delve into it elsewhere by returning with the focus on Physics and its most enigmatic formulas, excellent for the brain muscles.

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Video: Visualizing the Planck Length. Why is it the Smallest Length in the Universe? (November 2021).