Physics Unit 7 - Light and Optics (Practice Test)

Unlike mechanical waves, EM waves can travel through

• a vacuum
• water
• the ground
• air

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An object appears red because it

• reflects light waves of all colors
• reflects light waves of red
• absorbs light waves of red
• transmits light waves of all colors

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Which electromagnetic wave carries the most energy?

• gamma waves
• microwaves
• radio waves
• light waves

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Speed of light in a vacuum is

• represented by the symbol "c"
• 3.00 X10⁸ m/s 
• is constant
• all answers are correct

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Why is light refracted?

• Light speeds up
• Light slows down
• Light speed stays the same
• Light can either slow down or speed up

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When all 3 primary light colors are mixed which color is produced?

• black
• magenta
• white
• cyan

Light is considered to be

• electromagnetic waves
• particles
• transverse waves
• all of the above

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What are the three primary colors of light?

• Red,Yellow,Blue

• Red,Green,Yellow

• Red,Green,Blue

• Yellow,Blue,Green

What does it mean to polarize light?

• Blocks light

• Causes light to travel in only one plane

• Reduces the amount of light

• Looks cool

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Which is true of a green grape?

• It absorbs green light.
• It absorbs white light.
• It reflects green light.
• It reflects white light.