Planck constant | Wikipedia audio article
Channel: wikipedia tts
Date: 25/12/2018

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Planck_constant


00:02:17 1 Significance of the value
00:03:28 2 Origins
00:04:21 2.1 Black-body radiation
00:04:30 2.2 Photoelectric effect
00:09:45 2.3 Atomic structure
00:13:03 2.4 Uncertainty principle
00:14:15 3 Photon energy
00:16:21 4 Value
00:18:23 5 Dependent physical constants
00:24:44 5.1 Rest mass of the electron
00:30:06 5.2 Avogadro constant
00:30:49 5.3 Elementary charge
00:32:54 5.4 Bohr magneton and nuclear magneton
00:33:11 6 Determination
00:33:21 6.1 Josephson constant
00:35:09 6.2 Kibble balance
00:37:22 6.3 Magnetic resonance
00:39:39 6.4 Faraday constant
00:41:33 6.5 X-ray crystal density
00:43:11 6.6 Particle accelerator
00:44:15 7 Fixation
00:44:37 8 See also
00:50:28 9 Notes
00:52:00 10 References
00:53:45 11 External links
00:54:11 11.1 Videos
00:57:46 See also



Listening is a more natural way of learning, when compared to reading. Written language only began at around 3200 BC, but spoken language has existed long ago.

Learning by listening is a great way to:
- increases imagination and understanding
- improves your listening skills
- improves your own spoken accent
- learn while on the move
- reduce eye strain

Now learn the vast amount of general knowledge available on Wikipedia through audio (audio article). You could even learn subconsciously by playing the audio while you are sleeping! If you are planning to listen a lot, you could try using a bone conduction headphone, or a standard speaker instead of an earphone.

Listen on Google Assistant through Extra Audio:
https://assistant.google.com/services/invoke/uid/0000001a130b3f91
Other Wikipedia audio articles at:
https://www.youtube.com/results?search_query=wikipedia+tts
Upload your own Wikipedia articles through:
https://github.com/nodef/wikipedia-tts



"There is only one good, knowledge, and one evil, ignorance."
- Socrates



SUMMARY
=======
The Planck constant (denoted h, also called Planck's constant) is a physical constant that is the quantum of action, which relates the energy carried by a photon to its frequency. A photon's energy is equal to its frequency multiplied by the Planck constant.  The Planck constant is of fundamental importance in quantum mechanics, and in physical measurement, it is the basis for the definition of the kilogram.
At the end of the 19th-century, physicists were unable to explain why the observed spectrum of black body radiation, which by then had been accurately measured, diverged significantly at higher frequencies from that predicted by existing theories. In 1900, Max Planck empirically derived a formula for the observed spectrum by assuming that a hypothetical electrically charged oscillator in a cavity that contained black body radiation could only change its energy in a minimal increment, E, that was proportional to the frequency of its associated electromagnetic wave. He was able to calculate the proportionality constant, h, from the experimental measurements, and that constant is named in his honor. In 1905, the value E was associated by Albert Einstein with a "quantum" or minimal element of the energy of the electromagnetic wave itself. The light quantum behaved in some respects as an electrically neutral particle, as opposed to an electromagnetic wave. It was eventually called a photon.
Since energy and mass are equivalent, the Planck constant also relates mass to frequency. By 2017, the Planck constant had been measured with sufficient accuracy in terms of the SI base units, that it was central to replacing the metal cylinder, called the International Prototype of the Kilogram (IPK), that had defined the kilogram since 1889. The kilogram was the last base unit in the SI to be defined by a procedure to relate it to a fundamental physical property. The new definition was unanimously approved at the General Conference on Weights and Measures (CGPM) on 16 November 2018 as part of the 2019 redefinition of SI base units. For this new definition of the kilogram, the Planck constant, as defined by the ISO standard, was set to 6.626070150×10−34 J⋅s exactly.