Tuesday, 21 January 2020, 7:18 AM
Site: The Science Portal: 21C Science with Style
Course: The Science Portal: 21C Science with Style (21CScience)
Glossary: IB Physics Glossary
Q

#### Quality factor

$Q$, is a measure of the ionization strength of various radioactive source.

 Radiation type Q $\alpha$ 20 Fast neutrons 10 Slow neutrons 3 Fast protons 1 $\beta, \gamma$, X-rays 1

#### Quantum efficieny

is the ratio of emitted electrons to incident photons falling on a pixel.
Increasing the quantum efficiency makes the CCD more sensitive to light.

#### Quasar

is a quasi-stellar radio source. A compact region in the center of a black hole. (d)