On the plus side it’s pretty cool to estimate planck’s constant using an LED and a voltmeter. On the other hand, it’s frustrating because all the estimates are 10-20% low.

So, to find the value of Planck's constant, I need to divide the slope by the speed of light (remember, c = 3 x 10 8 m/s). With that, I get h = 6.25163 x 10 -34 J s.

Currently, Planck's constant is expressed as 6.62607015 x 10^(-34) joule-seconds. You might want to remember that in case you ever need to save the world. There's a Brand-New Kilogram, And It's ...

Planck's constant is a pretty important part of modern physics, but it's also pretty confusing. Maybe you were wondering what it was while reading about the new kilogram definition. Well never ...

8 thoughts on “ Measuring Planck’s Constant (Again) ” Zellers says: August 18, 2023 at 10:52 pm What if I don’t ‘need’ to translate the page ? Report comment. Reply.

Planck’s constant is in effect the number that launched the field of quantum physics. In 1900 the German scientist Max Planck proposed h as a measure of the size of energy “packets”, or ...

image: The NIST-4 watt balance has measured Planck's constant to within 34 parts per billion, demonstrating that the high-tech scale is accurate enough to assist with 2018's planned redefinition ...

The scale, called the NIST-4 watt balance, has conducted its first measurement of a fundamental physical quantity called Planck's constant to within 34 parts per billion -- demonstrating the scale ...

The key lies in the fact that the Planck time, along with the other Planck units, incorporates both the gravitational constant G and Planck’s constant h, which is central to quantum theory.

Planck’s constant is one of the most important numbers in science. It describes the relationship between the energy and frequency of an electromagnetic wave in an equation known as the Planck ...

Universal mass: NIST's fourth-generation watt balance. (Courtesy: Tushna Commissariat) The latest version of the watt balance at the US National Institute of Standards and Technology (NIST) has made ...