# Why is Planck's Constant important?

##### 1 Answer

Planck's constant is instrumental and an unavoidable constant which appears in quantum mechanics.

#### Explanation:

Even though it was first introduced in the Planck's law,

Where one quantum of radiation would have an energy,

Today almost all important relationships in quantum mechanics, contain Planck's constant (or the reduced Planck's constant

Examples would include,

1) de Broglie relation -

2) Schrodinger equation -

3) Commutator of

And so on.

It is to quantum mechanics, what the constants