Waves. Wave physics, characteristics and properties
The online wave simulations on this page are a practical way to introduce you to wave physics. We will discover the characteristics and properties of waves, their most important types, and why wave physics is so important.
This Thematic Unit is part of our Physics collection

STEM OnLine mini dictionary
Electromagnetic Wave
Perturbation of electric and magnetic fields that self-propagates in a vacuum, carrying energy without the need for a material medium.
Frequency
Number of complete turns or revolutions an object makes in a given unit of time.
Longitudinal Wave
Wave in which the vibration of the particles occurs in the same direction as the wave propagation.
Mechanical Wave
Type of wave that strictly requires a material medium (solid, liquid, or gas) in order to propagate.
Propagation Speed
Speed at which the perturbation travels, defined by the product of frequency and wavelength.
Transverse Wave
Wave in which the vibration of the particles is perpendicular to the direction of energy propagation.
Wave
Perturbation that propagates carrying energy without net transfer of matter, measured in joules (J) for the energy carried.
Wave amplitude
Maximum displacement of the perturbation from its equilibrium position or central value.
Wavelength
Physical distance between two consecutive points that are in the same state of vibration, measured in meters (m).
What are waves
Waves are disturbances that propagate through a medium or, in some cases, even in a vacuum, transporting energy without any net displacement of matter. In wave physics, we study both mechanical waves, which need a material medium to propagate, and electromagnetic waves, which can travel through a vacuum. Understanding what waves are and how they behave is essential for explaining everyday phenomena such as sound, light, and ocean waves, as well as for developing technologies in communication, medicine, and energy.
Characteristics of waves
Waves are described by a series of fundamental properties that allow them to be analyzed and compared. Among the most important are amplitude, which indicates the intensity of the wave; frequency, which determines how many complete cycles occur per second; wavelength, which is the distance between two consecutive equivalent points; and propagation speed, which indicates how fast the disturbance moves through the medium. In addition, waves have crests and troughs that represent the maximum and minimum points of displacement, facilitating their study in both mechanical and electromagnetic waves.
Properties of waves
Waves have various properties that determine how they interact with their environment and with each other. Among the most relevant are reflection, which occurs when a wave bounces off an obstacle; refraction, which is the change of direction when passing from one medium to another; diffraction, which allows waves to deviate when surrounding obstacles; and interference, which occurs when two or more waves overlap, generating reinforcement or cancellation patterns. These properties are essential for understanding everyday phenomena and for the development of technologies in acoustics, optics, and telecommunications.
Types of waves
In wave physics, waves are classified according to their mode of propagation and the medium in which they travel.
Mechanical waves
Mechanical waves require a material medium to propagate, such as sound in air or ocean waves. They are subdivided into:
Transverse: the vibration of the medium is perpendicular to the direction of propagation.
Longitudinal: the vibration occurs in the same direction as the wave’s movement.
Electromagnetic waves
Electromagnetic waves do not need a medium and can propagate in a vacuum. They include visible light, radio waves, and X-rays.
Importance of wave physics
Wave physics plays a fundamental role in many fields of science, technology, and everyday life. Thanks to its study, we understand natural phenomena such as sound, light, ocean waves, and earthquakes, and we develop technological applications such as telecommunications, medical imaging, acoustics, optics, and energy. Understanding waves and their properties allows us to design more efficient devices, improve information transmission, and explain complex phenomena in the universe, from radio waves to X-rays and visible light.

STEM OnLine mini dictionary
Electromagnetic Wave
Perturbation of electric and magnetic fields that self-propagates in a vacuum, carrying energy without the need for a material medium.
Frequency
Number of complete turns or revolutions an object makes in a given unit of time.
Longitudinal Wave
Wave in which the vibration of the particles occurs in the same direction as the wave propagation.
Mechanical Wave
Type of wave that strictly requires a material medium (solid, liquid, or gas) in order to propagate.
Propagation Speed
Speed at which the perturbation travels, defined by the product of frequency and wavelength.
Transverse Wave
Wave in which the vibration of the particles is perpendicular to the direction of energy propagation.
Wave
Perturbation that propagates carrying energy without net transfer of matter, measured in joules (J) for the energy carried.
Wave amplitude
Maximum displacement of the perturbation from its equilibrium position or central value.
Wavelength
Physical distance between two consecutive points that are in the same state of vibration, measured in meters (m).
Explore the exciting STEM world with our free, online, simulations and accompanying companion courses! With them you’ll be able to experience and learn hands-on. Take this opportunity to immerse yourself in virtual experiences while advancing your education – awaken your scientific curiosity and discover all that the STEM world has to offer!
Wave simulations
Waves in water
If a stone is thrown into a still pool of water, concentric waves are created and spread out around it. If the waves are generated next to a floating object, it can be observed that the object does not move and will only vibrate up and down. This is because, although the wave is displaced, the medium (water in this case) only vibrates vertically.
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“If I have seen further, it is by standing on the shoulders of giants”
Isaac Newton
Daniel Bernoulli
–
Leonhard Euler
–
Become a giant
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“If I have seen further, it is by standing on the shoulders of giants”
Isaac Newton
William Rowan Hamilton
–
Daniel Bernoulli
–
Become a giant
Mechanics, Part 2
Mechanics, Part 1
Dynamics and Control
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Test your knowledge
What is a wave and what are its main characteristics?
What is the difference between mechanical and electromagnetic waves?
How is it that we can hear music through the air if sound waves are invisible?
Does it make sense that light can travel through a vacuum if we usually associate movement with a physical medium?
So, how does the frequency of a wave affect what we perceive, for example, in sound or light?
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