#### Definition of Blackbody

An ideal blackbody is an object that absorbs all radiation that strikes it.

#### Definition of Blackbody Radiation

- the electromagnetic radiation emitted by a blackbody. Cool blackbodies emit mostly long wavelengths (microwave or infrared). As they heat up, blackbodies radiate more high energy (short wavelength) ultraviolet emissions.

### Quantum Hypothesis

Planck developed an equation that accurately described blackbody radiation. The equation contained a term that became interpreted to mean that **particles could only vibrate with discrete amounts of energy**. This is the quantum hypothesis.

#### Blackbody Radiation Explained

The Birth of Modern Science