Quantum Phenomena

Question 1

Photoelectric effect

Answer 1

Emission of electrons from the surface of a material due to the exposure of the material to electromagnetic radiation

Question 2

Work function

Answer 2

Minimum energy required for an electron to escape from the surface of the material

Question 3

Threshold frequency

Answer 3

Minimum frequency pf photons required for photoelectrons to be emitted from the surface of a metal plate through the photoelectric effect. Equal to the metal’s work function/Planck’s constant

Question 4

Stopping potential

Answer 4

Minimum potential difference needed to stop the highest kinetic energy electrons from leaving the metal plate in photoelectric effect

Question 5

Electron diffraction

Answer 5

The spreading of electrons as they pass through a gap similar to the magnitude of their de Broglie wavelength. It’s evidence of the wave-like properties of particles

Question 6

Energy levels

Answer 6

Defined and distinct energies at which electrons can exist in an atom. An electron can’t exist between energy levels

Question 7

Excitation

Answer 7

The process of an electron taking in exactly the right quantity of energy to move to a higher energy level.

Question 8

Ground State

Answer 8

The most stable energy level that an electron that can exist in