## What is the Planck scale?

## How long is a Planck time?

- Planck time is roughly
**10−44 seconds**. However, to date, the smallest time interval that was measured was**10−21 seconds**. One Planck time is the time it would take a photon travelling at the speed of light to cross a distance equal to one Planck length .

## What is Planck distance?

- The more correct name is the Planck distance! and the definition of the Planck distance is the distance that
**energy travels through energy during a Planck time interval**. The Planck distance divided by the Planck time interval is always the speed of light.

## What is the Planck scale?What is the Planck scale?

Freebase(0.00 / 0 votes)Rate this definition: Planck scale. In particle physics and physical cosmology, the Planck scale is an energy scale around **1.22 × 1019 GeV** at which quantum effects of gravity become strong.

## How long is a Planck time?How long is a Planck time?

Planck time is roughly **10−44 seconds**. However, to date, the smallest time interval that was measured was **10−21 seconds**. One Planck time is the time it would take a photon travelling at the speed of light to cross a distance equal to one __Planck length__.

## What is Planck distance?What is Planck distance?

The more correct name is the Planck distance! and the definition of the Planck distance is the distance that **energy travels through energy during a Planck time interval**. The Planck distance divided by the Planck time interval is always the speed of light.