Optical phenomena and properties of materials Flashcards Preview

GRADE 12 Physical Sciences > Optical phenomena and properties of materials > Flashcards

Flashcards in Optical phenomena and properties of materials Deck (6)
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1

Photoelectric effect

The process whereby electrons are ejected off the surface of a metal when light of suitable frequency is incident on that surface

2

Threshold frequency

minimum frequency of light needed to emit electrons from a certain metal surface

3

Work function

minimum energy that an electron in the metal needs to emitted from the surface of the metal

4

Continuous emission spectrum

shows all possible wavelengths of light in the visible part of the electromagnetic spectrum

5

Line emission spectrum

Emitted by hot gases under low pressure where electrons make transitions from higher energy levels to lower energy levels. Photons of specific energies emitted

6

Line absorption spectrum

When white light passes through a cold gas at low pressure. Electrons make transitions from low energy levels to high energy levels. Photons of specific energies absorbed.