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- Light is a transverse, electromagnetic wave that can be seen by the typical human.
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This happens when an electron interacts with a light wave, but because the light wave is an oscillating field the electron moves to and fro and there is no net motion. If you could watch an electron as light passes by you'd see it start oscillating to and fro, but it's net position wouldn't change.
For example, when visible light encounters anything large enough that we can observe it with unaided eyes, such as a coin, it acts like a ray, with generally negligible wave characteristics. In all of these cases, we can model the path of light as straight lines.
- Introduction
- Sources
- Speed
- Other Characteristics
Light is a transverse, electromagnetic wave that can be seen by the typical human. The wave nature of light was first illustrated through experiments on diffraction and interference. Like all electromagnetic waves, light can travel through a vacuum. The transverse nature of light can be demonstrated through polarization. 1. In 1678, Christiaan Huyg...
Light is produced by one of two methods… 1. Incandescenceis the emission of light from "hot" matter (T ≳ 800 K). 2. Luminescence is the emission of light when excited electrons fall to lower energy levels (in matter that may or may not be "hot").
Just notes so far. The speed of light in a vacuum is represented by the letter c from the Latin celeritas— swiftness. Measurements of the speed of light. Ole Rømer (1644–1710) Denmark. "Démonstration touchant le mouvement de la lumière trouvé par M. Roemer de l'Académie des Sciences." Journal des Scavans. 7 December 1676. Rømer's idea was to use th...
The amplitude of a light wave is related to its intensity. 1. Intensityis the absolute measure of a light wave's power density. 2. Brightnessis the relative intensity as perceived by the average human eye. The frequency of a light wave is related to its color. 1. Coloris such a complex topic that it has its own section in this book. 2. Monochromati...
We know that light is a wave based on how it behaves – it exhibits the same properties of other waves we have examined – it interferes with itself, it follows an inverse-square law for intensity (brightness), and so on.
Is light a wave or a particle? How is it created? And why can’t humans see the whole spectrum of light? All your questions answered.
In all of these cases, light is modeled as traveling in straight lines called rays. Light may change direction when it encounters objects (such as a mirror) or in passing from one material to another (such as in passing from air to glass), but it then continues in a straight line or as a ray.
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Much like Aristotle, he believed that light was a disturbance that traveled through the plenum, like a wave that travels through water. Pierre Gassendi, a contemporary of Descartes, challenged this theory, asserting that light was made up of discrete particles.
