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# Unit F Chapter 1

### Light Waves

What is the definition of wavelength? The distance from one crest of the wave to the next crest.
This is the unit measurement for frequency. Hertz (Hz)
The number of waves produced each second is the ... Frequency of a wave
True or False. Laser beams spread out their light in all directions and incandescent light bulbs shine light in only one direction. False; laser beams only direct light in one direction.
The __________ is the high point of a wave. crest
The height of the wave from its resting position to its highest or lowest point is called... the amplitude
What is the definition of a vacuum? A region that is empty of any matter.
A wave transfers what? Energy
Who invented the first incandescent light bulb? Thomas Edison
True or False.A lightening bolt is an artificial (man-made) source of light. False; It's a natural source of light.
On the EM Spectrum, which rays have a shorter wavelength: X-rays or Radio Rays? X-rays
Out of all of the visible light colors that we see, which color has the longest wavelength? Red
Complete the sentence: When the wavelength is shorter, the frequency of the wave is (greater/less). greater; with shorter wavelengths, the waves are seen more often or frequently.
If a wave has a high frequency, what does that mean about its energy? (greater/less) Its energy is greater.
A convex mirror curves outward at the middle. It makes an image that is _________ than the actual object. Smaller
A concave mirror curves inward at the middle. The image formed in the mirror looks _________ than the actual object. Larger
True or False: A plane mirror doesn't change the image at all. False,the image is backwards.
What is the definition of refraction? The bending of light as it passes from one material to another. (Ex: passing from air to water in our pencil experiment.)
Why do we sometimes see mirages on summer days? The sunlight is refracted because the air near the road is warmer than the air high above the road which creates an image of the sky on the road.
Created by: wahlenm
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