# Planck's constant, h. The limit goes to zero?

• Katiethedil
In summary, Planck's constant, denoted as h, is a fundamental constant in quantum mechanics that relates the energy of a photon to its frequency. It is important because it helps us understand the behavior of particles at the atomic and subatomic level. The value of Planck's constant is approximately 6.626 x 10^-34 Joule seconds. The limit to Planck's constant is a fundamental limit in quantum mechanics that arises from the uncertainty principle, which states that it is impossible to know the exact position and momentum of a particle at the same time. If the limit to Planck's constant goes to zero, it would mean that the uncertainty principle is no longer applicable, and the behavior of particles at the subatomic level
Katiethedil
Why does it work out classically that the limit of h goes to zero? I'm reading a paper that says in QM, this is different. It's also talking about Bohr. Any ideas?

Thanks Bob. I'm not sure why this paper says that.

## What is Planck's constant and why is it important?

Planck's constant, denoted as h, is a fundamental constant in quantum mechanics that relates the energy of a photon to its frequency. It is important because it helps us understand the behavior of particles at the atomic and subatomic level.

## What is the value of Planck's constant?

The value of Planck's constant is approximately 6.626 x 10^-34 Joule seconds.

## Why is there a limit to Planck's constant?

The limit to Planck's constant is a fundamental limit in quantum mechanics that arises from the uncertainty principle. This principle states that it is impossible to know the exact position and momentum of a particle at the same time, and the limit to Planck's constant is a consequence of this uncertainty.

## What happens if the limit to Planck's constant goes to zero?

If the limit to Planck's constant goes to zero, it would mean that the uncertainty principle is no longer applicable, and the behavior of particles at the subatomic level would change drastically. This would have significant implications in the field of quantum mechanics and our understanding of the universe.

## How is Planck's constant used in everyday life?

Although Planck's constant may seem like an abstract concept, it actually has many practical applications in everyday life. It is used in the development of technologies such as solar cells, lasers, and LED lights. It is also used in medical imaging techniques like MRI scanners. Without Planck's constant, many of these technologies would not be possible.

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