Light What is Light Light is composed of

What is Light? • Light is composed of particles called photons which are massless

Properties of Light • Light travels in straight lines: Laser

• Light travels VERY FAST – around 300, 000 kilometres per second. At

• Light travels much faster than sound. For example: 1) Thunder and lightning

Electromagnetic • Electromagnetic waves- is energy traveling in a wave that is partially electric

Electromagnetic Spectrum • Radio, microwaves, infrared, visible light, ultraviolet, x-rays and gamma rays •

Color • White light is not a single color; it is made up of

The colors of the rainbow: (ROY G BIV) • Red Orange • Yellow •

Objects and Light • Transparent Objects- visible light can pass through them. Example: Clear

• Shadows A shadow is formed where light can’t reach. The larger the

Polarization • Light waves are transverse and that means they can be polarized-when waves

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Light

What is Light? • Light is composed of particles called photons which are massless bundles of concentrated electromagnetic energy and the travel in waves. Transverse Waves

Properties of Light • Light travels in straight lines: Laser

• Light travels VERY FAST – around 300, 000 kilometres per second. At this speed it can go around the world 8 times in one second. A light-year is the distance light travels in one year and is a unit of measure.

• Light travels much faster than sound. For example: 1) Thunder and lightning start at the same time, but we will see the lightning first. 2) When a starting pistol is fired we see the smoke first and then hear the bang.

Electromagnetic • Electromagnetic waves- is energy traveling in a wave that is partially electric and partially magnetic. • Electromagnetic Spectrum- all the electromagnetic waves that reach earth.

Electromagnetic Spectrum • Radio, microwaves, infrared, visible light, ultraviolet, x-rays and gamma rays • Organized from longest wavelength to shortest • We have various uses for each type of wave

Color • White light is not a single color; it is made up of a mixture of the seven colors of the rainbow. We can demonstrate this by splitting white light with a prism: This is how rainbows are formed: sunlight is “split up” by raindrops.

The colors of the rainbow: (ROY G BIV) • Red Orange • Yellow • Green • Blue • Indigo • Violet

Objects and Light • Transparent Objects- visible light can pass through them. Example: Clear glass • Opaque Objects- No light passes through them. Example wood, bricks etc. • Translucent Object- some light passed through. Example: Frosted Glass

• Shadows A shadow is formed where light can’t reach. The larger the light source the larger the shadow. Shadows are places where light is “blocked”: Rays of light

Polarization • Light waves are transverse and that means they can be polarized-when waves travel in one direction. Polarized lenses filter light and caused it to be polarized reducing glare.