amplitude
antinode

beats
bore

coherence

diffraction

echo
electromagnetic radiation
electromagnetic spectrum

frequency

gamma rays

harmonics
Helmholtz resonator
hertz
holography

infrared
interference

light

Maxwell's equations
microwave radiation

node

period
phase
polarization
polarized light

radio waves
reflection
resonance

simple harmonic motion
soliton
standing wave

ultraviolet

wave
wavefunction
wavelength
wave-particle duality

X-rays