The rhythmic patterns of energy moving through water, air, light and sound, shaping the world in endless oscillation.
Waves are disturbances that transfer energy from one place to another without permanently displacing the medium they travel through. Their patterns are among the most universal in physics and nature.
Every wave is defined by its amplitude (height), wavelength (distance between peaks), frequency (cycles per second) and speed. These properties determine everything from the pitch of a musical note to the colour of light.
The mathematical description of a simple wave, the sine function, is one of the most important tools in all of science and engineering.
Ocean waves begin as wind transfers energy to the water surface. Small ripples grow into swells that can travel thousands of kilometres across open ocean. When these waves approach shore, the sea floor forces them to slow and steepen until they break.
The patterns waves create on sandy beaches, from ripple marks to cusps, record the interplay of wave energy and sediment in beautiful, repeating forms.
Sound waves in air travel at approximately 343 metres per second, but in water they move nearly 4.4 times faster at about 1,480 metres per second. Whales exploit this property to communicate across entire ocean basins, with low-frequency calls travelling hundreds of kilometres.
From the visible ripples on a pond to the invisible electromagnetic spectrum, waves shape our experience of reality.
A single drop creates concentric circles that spread outward, demonstrating how wave energy radiates from a point source.
Compression waves travel through air as alternating regions of high and low pressure, creating the sounds we hear.
Wind-driven sand forms wave-like ripple patterns that mirror fluid dynamics at a completely different scale.
When light passes through narrow slits, it bends and interferes with itself, creating stunning striped wave patterns.
When waves bounce between boundaries they create stationary patterns with fixed nodes and anti-nodes, the basis of musical instruments.
Earthquakes generate waves that travel through the Earth in multiple forms, revealing the hidden structure of our planet's interior.
When two waves meet, they combine. If their peaks align (constructive interference), they create a larger wave. If a peak meets a trough (destructive interference), they cancel out. This principle explains everything from noise-cancelling headphones to the iridescent colours on a soap bubble.
When a wave source moves relative to an observer, the perceived frequency changes. An approaching ambulance siren sounds higher-pitched, then drops as it passes. This same principle applies to light: astronomers use the redshift of distant galaxies to measure how fast the universe is expanding.
Wave patterns are woven into daily experience in ways we rarely notice:
Gravitational waves, predicted by Einstein in 1915 and first detected in 2015, are ripples in the fabric of spacetime itself. The waves detected by LIGO were caused by two black holes merging 1.3 billion light years away, yet they compressed and stretched the detector's 4-kilometre arms by less than one-thousandth the diameter of a proton.