Matter Wave Visualization — Practice Quiz

Question 1

The wave function |ψ|² represents:

Accepted Answer

Probability density of locating the particle

Answer

The wave amplitude

Answer

Total energy

Answer

Momentum

Question 2

Standing matter waves in a 1D box of length L of an electron give allowed wavelengths:

Accepted Answer

λ_n = 2L/n

Answer

λ_n = L/n

Answer

λ_n = L·n

Answer

Any λ

Question 3

Group velocity of a matter wave equals:

Accepted Answer

The particle velocity

Answer

c

Answer

Phase velocity

Answer

Half the phase velocity

Question 4

Why don't we observe matter-wave interference for a baseball?

Accepted Answer

λ_dB ≈ 10⁻³⁴ m — too small to interfere with any aperture

Answer

Air absorbs the wave

Answer

Baseballs don't have de Broglie waves

Answer

Classical mechanics overrides quantum

Question 5

Schrödinger equation describes:

Accepted Answer

Time evolution of the quantum wave function

Answer

Photons

Answer

Classical particles

Answer

Electromagnetic waves only