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- Physics archive | Science | Khan Academy
Unit 4: Waves Introduction to mechanical waves Sound The Doppler effect Wave interference
- Light: Electromagnetic waves, the electromagnetic spectrum and photons
At the beginning of the twentieth century, the discovery that energy is quantized led to the revelation that light is not only a wave, but can also be described as a collection of particles known as photons
- Introduction to light (video) | Khan Academy
Light and the electromagnetic radiation spectrum Wave and particle-like behavior, and how to calculate the wavelength or frequency of a light wave Created by Sal Khan
- The electromagnetic spectrum (article) | Khan Academy
Our eyes are exposed to light of all wavelengths, but our brains have evolved to only be able to process a small sliver of the electromagnetic spectrum Only light between about 400 – 700 nm (which we call the visible light range) is detectable to our brains
- Unit 6: Waves, sound, and physical optics - Khan Academy
Learn ways to quantify a wave, including amplitude, wavelength, period, frequency, and wave speed, and how light can be modeled as a wave Explore diffraction and interference, polarization, the Doppler effect, and thin-film interference
- Diffraction and constructive and destructive interference
Radio waves can have wavelengths as wide as your arms (and even longer!), while visible light waves have wavelengths as small as a thousandth of the width of a human hair
- The electromagnetic spectrum (video) | Waves | Khan Academy
Light is an electromagnetic wave All electromagnetic waves travel at the speed of light in vacuum The frequency of a light wave corresponds to its color The amplitude of a light wave corresponds to its brightness
- Electromagnetic waves and the electromagnetic spectrum - Khan Academy
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
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