Nature of light and quantum mechanics (Modules 7 and 8) quiz

Is composed of particles only

Exhibits wave behaviour through interference

Travels at constant speed in glass

Has zero rest mass

$\frac{1}{\sqrt{\epsilon_0 \mu_0}}$

$\frac{1}{\epsilon_0 \mu_0}$

$\sqrt{\frac{\epsilon_0}{\mu_0}}$

$\epsilon_0 \mu_0$

Brighter light always ejects more energetic electrons

Electrons are ejected only above a threshold frequency, independent of intensity

The effect occurs only with red light

Electrons are ejected after a delay proportional to intensity

$\frac{h}{f}$

$hf$

$hc$

$hf^2$

Electrons can have any energy

Electrons orbit in fixed quantised energy levels and emit photons of definite energy when transitioning between them

The proton is also quantised

Hydrogen has only one electron

Only photons have wave behaviour

Matter particles have an associated wavelength $\lambda = \frac{h}{p}$

Only electrons have wave behaviour

Mass and energy are interchangeable

Runs faster

Runs slower by a factor of $\gamma = \frac{1}{\sqrt{1 - v^2/c^2}}$

Runs at the same rate

Stops completely above $0.5c$

Mass and energy are equivalent and interconvertible

Only light has energy

Mass is destroyed in chemical reactions

Nothing can move faster than light

Total nucleon count decreases

Mass before equals mass after

A small mass defect is converted into energy via $E = mc^2$

Charge is not conserved

Lepton

Quark

Gauge boson (mediator of the electromagnetic force)

Composite particle made of quarks

We cannot know the energy of a photon

Position and momentum cannot both be known to arbitrary precision simultaneously

Time travel is impossible

Light has zero mass

Light is both a wave and a particle.

Wave-particle duality is interesting.

Wave-particle duality, established by Young's interference and the photoelectric effect, drives modern technologies from solar cells to electron microscopes via Planck's relation and de Broglie's hypothesis.

Physics is full of surprises.