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Chapter 16: Lesson 1 - The Facts of Light
Chapter 16: Lesson 1 - The Facts of Light
Chemistry Based Review About Light
Chemistry Based Review About Light
Click on the video for a fun chemistry based review on light!
Click on the video link, then you have to click on the link that says, watch this video on YouTube in order to be able to see it.
Electromagnetic Wave
Electromagnetic Wave
Light is an electromagnetic wave. An electromagnetic wave consists of both an electric part and a magnetic part. The magnetic and electric waves are perpendicular to each other. Light is the range of frequencies of electromagnetic waves that stimulates the retina of the eye.
Light is a transverse wave that consists of an electric and a magnetic part.
Light is Energy!
Light is Energy!
Light contains energy. Light also travels in a straight line. Click on the video to see a demonstrations of light as a form of energy using a radiometer.
The Electromagnetic Spectrum
The Electromagnetic Spectrum
The electromagnetic spectrum contains radio waves, microwaves, infrared, visible light waves, ultraviolet, x-rays, and gamma rays. If you look at the electromagnetic spectrum with radio waves on the left hand side of the electromagnetic spectrum, then everything on the left hand side of the electromagnetic spectrum has a long wavelength, low frequency, and low energy. It all starts with L, like left. That means that on the right hand side, with gamma rays, the wavelength is short, the frequency is high, and the energy is also high.
The visible light spectrum is actually a small part of the electromagnetic spectrum. This picture shows how much of the electromagnetic spectrum each piece occupies. Be careful, this picture of the electromagnetic spectrum shows gamma rays on the left hand side rather than the right.
Light waves have wavelengths from 400 nm (4x10-7 m) - violet light, to 700 nm (7x10-7 m) - red light.
Light can be represented by a straight line. This is called a ray. A ray is a straight line that represents the path of a very narrow beam of light. The ray model of light states that light may be represented by a straight line along the direction of motion.
Sources of Light
Sources of Light
Light can either give off light or reflect light. A body that emits light waves is luminous. Candles, lightbulbs, the sun, a fire, are all luminous.
A body that reflects light waves is illuminated. Paper, pens, pencils, stapler, and paperclips are all illuminated.
Materials can be transparent, translucent, or opaque. It all depends on what happens to the light when it hits the material on how the material is classified.
Transparent
Transparent
Materials that transmit light waves, objects can be clearly seen through transparent materials. All of the light is transmitted.
Translucent
Translucent
These materials transmit light, but do not allow objects to be seen clearly. Light is absorbed, transmitted, and reflected.
Opaque
Opaque
These materials absorb or reflect all the light waves that fall on them. Objects cannot be seen on the other side of the material.
Check Your Understanding:
Check Your Understanding:
Click on the down arrow when you have your answer to check to see if you are correct.
What type of wave is light?
Light is an electromagnetic wave. It is a transverse wave.
2. Does the color red have a long or a short wavelength?
The color red has a long wavelength.
3. Do radio waves have a long or a short wavelength? High or low frequency? High or low energy?
Radio waves are on the left side of the electromagnetic spectrum. That means that radio waves have a long wavelength, low frequency, and low energy.
4. Is wax paper transparent, translucent, or opaque?
Wax paper is translucent. You can see something that there is something on the other side of the wax paper, but it is not clearly seen.
You have finished Lesson 1!
You have finished Lesson 1!
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