Wave (physics)

A wave is a disturbance that propagates through space and time, transferring energy without permanently displacing the medium itself. Waves are fundamental to physics, appearing wherever cause and effect interact across distance—from ripples on water to light traveling through the vacuum.

Waves are characterized by their Wavelength, frequency, and amplitude. The relationship between these properties is captured by the wave equation, a cornerstone of theoretical physics. Waves exhibit remarkable behaviors: they interfere with one another, bend around obstacles, and reflect off boundaries. These phenomena explain everything from why Sound is louder in some rooms to how X-rays image our bones.

Two broad classes exist: mechanical waves (like Sound and water ripples) require a medium to propagate, while electromagnetic waves (infrared, visible light, X-rays) travel through empty space. The mathematics of waves—their harmonics, eigenmodes, and solutions to the wave equation—connects to Periodic motion, Deformation, and countless applications in engineering, medicine, and astronomy.

Understanding waves unlocks mysteries from the quantum realm to the cosmos.

Related

Light, Sound, Quantum mechanics, Interference, Refraction, Electromagnetic radiation