Sound and light are similar in that both are forms of energy that travel in waves. They both have properties of wavelength, freqency and amplitude. Sound can only travel through a medium (substance) while light can travel through empty space. Sound is a form of mechanical energy caused by vibrations of matter.

However, if a region contains any matter, even dust, light can bend when it comes in contact with the particles, which results in a decrease in speed. Light traveling through Earth’s atmosphere moves almost as fast as light in a vacuum, while light passing through a diamond is slowed to less than half that speed.

Light behaves as a wave – it undergoes reflection, refraction, and diffraction just like any wave would.

At the speed of light, both photons pass. Photons are bosons, considered by the subatomic particles, with no electric charge or resting mass and one unit of spin; they are field particles that are assumed to be electromagnetic field carriers.

Along with all other quantum objects, an electron is partly a wave and partly a particle. To be more accurate, an electron is neither literally a traditional wave nor a traditional particle, but is instead a quantized fluctuating probability wavefunction.

Note that an electron is a fundamental particle; it is not made out of anything else (according to our current experiments and theories). All fundamental particles interact as shapeless points when acting like particles.

The fundamental particle that has least mass is electron.

Usually light is treated as either a wave or particles, because it behaves as such in some situations. The particles are called photons. Fire emits light, therefore fire creates photons from energy. The flame you see is air behaving as a plasma.

Photons are easily created and destroyed. The movement of electrons is responsible for both the creation and destruction of the photons, and that’s the case for a lot of light production and absorption. An electron moving in a strong magnetic field will generate photons just from its acceleration.

@wendy explained the chemisty behind a fire, but the radiation of a fire is indeed electromagnetic radiation. infared, visible light is part of the electromagnetic spectrum, a fire also releases tiny amounts of x-rays, as well as microwaves and radio waves, all these waves are electromagtic waves.

Visible light is carried by photons, and so are all the other kinds of electromagnetic radiation like X-rays, microwaves and radio waves. In other words, light is a particle.

The speed of light in a vacuum, c, is 3.00*10^8 meters per second.

An explanation of where light comes from and how shadows are created. Light is produced from light sources such as a lamp, a candle or the Sun. Light travels away from a light source until it meets an object. When something blocks light travelling from a source, a shadow is made.

what happens when light enters water? It slows down. Why is light refracted when it passes from air to water? Light slows down when it enters the water.

When light travels from air into water, it slows down, causing it to change direction slightly. This change of direction is called refraction. When light enters a more dense substance (higher refractive index), it ‘bends’ more towards the normal line.

angle of refraction

Waves. Refraction is an effect that occurs when a light wave, incident at an angle away from the normal, passes a boundary from one medium into another in which there is a change in velocity of the light. Light is refracted when it crosses the interface from air into glass in which it moves more slowly.