Chapter 14&15 Questions
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Why is the sky blue?
Scattering of blue and violet light by air particles in the atmosphere.
What causes an object to be a certain color?
It reflects the color it appears and absorbs all other colors.
What are the seven types of waves?
• Radio • Microwaves • Infrared • Visible light • Ultraviolet • X-rays • Gamma rays
What is the main difference between radio and light waves?
Radio waves have a lower frequency.
How do the speeds of various electromagnetic waves compare?
In a vacuum all electromagnetic waves travel at the same speed.
What colors are the lowest and highly visible light frequency?
Lowest: red Highest: violet
How does the average speed of light in glass compare with its speed in a vacuum?
It’s slower in glass.
What frequency ranges of the radiation curve do red, green, and blue light occupy?
Lower frequencies occupy red light, middle frequencies occupy green, and high frequencies occupy blue.
What are the subtractive primary colors?
Magenta, cyan, yellow
Why are red and cyan called complementary colors?
They are added together to produce white.
Why does the sky sometimes appear white?
Particles of different sizes scatter.
Why does the sun look reddish at sunrise and sunset but not at noon?
The angle of the earth to the sun changes, scattering different colored light.
What is the evidence for a variety of particle sizes in a cloud?
Wavelengths are scattered creating white clouds.
Relative to the distance of an object in front of a plane mirror, how far behind the mirror is the image?
Your image is as far behind a mirror as you are in front of it.
What are the three types of mirrors?
• Flat or plane • Concave mirror • Convex mirror