Conceptual Physics Ch. 27 & 28

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Earth receives a lot of ultraviolet radiation from the sun. Luckily most of it doesn't reach the ground, because it is...

absorbed by a protective layer of ozone gas in the upper atmosphere

Color seen on TV result from color...

addition

Sunsets are red because...

all of the above

The color of an object we see is determined by the.....

all of the above

Because of absorption, a polarizing filter will actually transmit 40% of incident nonpolarized light. Two polarizing filters with their axes aligned will transmit...

between 0% and 40%

When blue and yellow paints are mixed together, the result is green. The reason for this is that...

between blue and yellow pigments, all colors are absorbed except green.

If molecules in the sky scattered orange light instead of blue light, sunsets would be colored...

blue

Different colors of light correspond to different light...

frequencies

If an electron vibrates up and down 1,000 times each second, it generates an electromagnetic wave having a...

frequency of 1000 Hz

If sunlight were green instead of white, the most comfortable color to wear on a hot day would be...

green

The true color of water is...

greenish blue

Light reflected from a lake surface is polarized...

horizontally

The colors of light emitted by incandescent gases show the...

identities of atoms in the gas

Heat lamps give off mostly

infrared rays

When Roemer took measurements of on of Jupiter's moons......(cont.)

late

What is the wavelength of an electromagnetic wave that has a frequency of 1 Hz?

less than 1 m

Compare to the wavelength of ultraviolet waves, the wave length of infrared waves is....

longer

The complementary color of green is....

magenta

When red and blue light shine on a white sheet, the resulting color is..

magenta

The three paint colors that are useful for color subtraction are...

magenta, cyan, and yellow

Clouds are white because water molecules...

of different sizes form clusters, scattering different colors of light.

Light does not pass through what kind of material?

opaque

Light that reflects at glancing angles from nonmetallic surfaces, such as glass, water, or roads is...

polarized parallel to the surface

Complementary colors are two colors that...

produce white light when added together

The cyan color of ocean water is evidence that the water absorbs...

red

Magenta light is really a mixture of....

red and blue light

The colored dots that make up the color on a TV screen are...

red, blue, and green

The three primary colors of light for additive mixing are...

red, green, and blue

The color of an opaque object is determined by the light that is...

reflected

The sky is blue because air molecules in the sky act as tiny...

resonators that scatter blue light

The shadow produced by an object held close to a piece of paper in sunlight will be...

sharp

Electromagnetic waves with higher frequencies have wavelegnths that are...

shorter

Compared to its speed in the air, the speed of light in water is...

slower

Which of the following is NOT an electromagnetic wave?

sound

Which of the following are fundamentally different from the others?

sound waves

If you're looking for an instrument that tells what stars are made of, look for a..

spectroscope.

Colors seen on a photograph result from color...

subtraction

Perception of death is given by...

the combination of views in the eye-brain system

The shiny surfaces of metals have most to do with...

the free electrons in metal atoms

Light shines on a pane of green glass and a pan of clear glass. The temperature will be higher in...

the green glass

You are designing hand-held stereo viewers....

the left eye sees only the left view and the right eye only sees the right view

The primary purpose of polarized sunglasses is...

to block glare from reflections.

After randomly polarized light passes through a polarizer, it is...

totally polarized

Clouds...

transmit UV light

Electromagnetic waves are..

transverse waves

Light waves are...

transverse waves

What is the ultimate source of electromagnetic waves?

vibrating charged particles

The source of all electromagnetic waves is..

vibrating charges

The main difference between a radio wave and a light wave is its...

wavelength

The complementary color of blue is...

yellow

When red and green light shine on a white sheet, the resulting color is...

yellow

A tennis ball is most easily seen if its color is...

yellow-green

Humans are most sensitive to light that is...

yellow-green

If two polarizing filters are held with their polarization axes at right angles to each other, the amount of light transmitted compared to when their axes are parallel is...

zero

What is the frequency of an electromagnetic wave having a wavelength of 300,000 km?

1 Hz

How far is a light-second?

300,000 km

Which of these electromagnetic waves has the shortest wave length?

X Rays

The reason the sky is blue is that air molecules

absorb and then reemit blue light, scattering it in all directions

The white caps of waves as they overturn are evidence that the water has...

broken into an assortment of tiny particles that scatter all colors.

Electromagnetic waves...

can travel through a vacuum.

A sheet of red paper will look black when illuminated with...

cyan light

Solar eclipses are seen less commonly than lunar eclipses because...

earth's shadow on the moon is larger than the moon's shadow on earth

If the sun were to disappear right now, we wouldn't know about it for 8 minutes because it takes 8 minutes..

for light to travel from sun to earth


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