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Learn how electromagnetic waves are formed from changing electric and magnetic fields. Understand the electromagnetic spectrum, including different regions from visible light to gamma rays and their uses.
Overview of key terms and skills for waves, including how to identify longitudinal and transverse waves.
Light, as electromagnetic waves, can oscillate in specific directions. This phenomenon is called polarization. Explore into the difference between polarized and non-polarized light, and see how polarization is important for everyday applications like sunglasses and 3D movies.
Mechanical waves require a medium like air, water, or a rope to travel through. On the other hand, light waves, which are a type of electromagnetic wave, don't need a medium. They can travel through the vacuum of space. Wave properties can also be represented as the brightness and color of light.
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Electromagnetic Waves: When an electric field and an accompanying magnetic field propagate through space as a radiated wave, they form an electromagnetic wave. These waves travel at the same speed as light and are generated not only from electric charges but also from changing magnetic fields.
Destructive interference happens when two waves overlap in such a way that they cancel each other out. Wave interference also depends on the relative phase of the two waves, as this video shows through the examples of path length differences and pi shifts.
Understanding the physics of waves has allowed humans to create incredible technologies that make our lives easier. Many technologies use different types of waves in order to send and receive information.
Khan Academy
Lesson 4: The Sun and solar storms. Anatomy of the Sun. Anatomy of the sun quiz. The Sun's energy. The Sun's energy quiz. The dynamic Sun. The dynamic Sun quiz. Solar wind and storms. Solar wind and storms quiz.