E.2 Quantum physics HL

Question 1

Photoelectric Effect

Answer 1

Evidence for the particle nature of light where light incident on a metal releases electrons if its frequency is above a certain threshold.

Question 2

Threshold Frequency

Answer 2

The minimum frequency of light required to release an electron from a metal, demonstrating the quantized nature of light.

Question 3

Work Function

Answer 3

The minimum energy needed to release an electron from a metal, illustrating the energy aspect of light particles

Question 4

Maximum Kinetic Energy Equation

Answer 4

h is Planck's constant, f is the frequency of the incident light, and ϕ is the work function.

Question 5

Compton Scattering

Answer 5

Phenomenon showing light behaves as particles, with the scattering angle affecting the shift in wavelength of photons

Question 6

De Broglie Wavelength

Answer 6

where λ is the wavelength associated with a particle, h is Planck's constant, and p is the particle's momentum, showcasing wave-particle duality

Question 7

Diffraction Pattern

Answer 7

The pattern formed when particles (like electrons) pass through a diffraction grating, evidence for their wave nature

Question 8

Wave-Particle Duality

Answer 8

Concept that all matter exhibits both wave-like and particle-like properties, fundamental to quantum mechanics

Question 9

Evidence for Wave Behavior

Answer 9

Phenomena such as diffraction and interference patterns in electron beams, supporting the wave nature of matter

Question 10

Evidence for Particle Behavior

Answer 10

The photoelectric effect and Compton scattering, which support the particle nature of light and matter