Quantum

Question 1

Photoelectric effect

Answer 1

The emission of electrons from a metal surface when the surface is irradiated with electromagnetic radiation above the threshold frequency

Question 2

Threshold frequency

Answer 2

fo is the minimum frequency of the incident radiation for the electron to escape

Question 3

Work function energy

Answer 3

The
minimum amount of the energy necessary to remove an electron from the surface of the material

Question 4

Stopping potential

Answer 4

The minimum retarding potential to
stop all the electrons from reaching the collector plate

Question 5

Emission line spectrum

Answer 5

A series of separate, differently coloured lines on a dark background corresponding to the wavelengths of
electromagnetic radiation emitted by atoms when excited electrons in the atoms return to their ground states

Question 6

Absorption line spectrum

Answer 6

The spectrum is produced when light from a hot body passes through a cooler gas; it appears as a series of
separate dark lines on a continuous spectrum