Unit 4 Test Review

Which best compares a nondigital and a digital camera?

• A nondigital camera produces images using mirrors, and a digital camera produces them using lenses.

• A nondigital camera produces a real image, and a digital camera produces a virtual image.

• A nondigital camera uses a concave lens to capture light, and a digital camera uses a convex lens.

• A nondigital camera uses film to record images, and a digital camera uses sensors.

How are reflecting telescopes similar to devices that produce laser light?

• Both use crystals to produce a beam of light.

• Both have convex lenses that magnify objects.

• Both have concave lenses that magnify objects.

• Both use mirrors to reflect a beam of light.

Which is one use of lasers?

• reproducing images to make them clearer

• producing a magnified image of the moon

• cutting an iron bar into two pieces

• making a leaf appear larger so its veins are visible

Which best explains why one laser beam might appear blue and another laser beam might appear red?

• The energy in laser beams is concentrated.

• The energy in laser beams is scattered

• Each laser beam is made up of all visible wavelengths of light.

• Each laser beam is made up of one specific wavelength of light.

Which best explains how fiber-optic technology has improved communication?

• It has eliminated the need to send audio data through telephones.

• It has allowed for faster transmission of Internet signals.

• It has increased the speed at which light travels through space.

• It has reduced society’s reliance on devices such as computers and cell phones.

Which example best illustrates that light behaves like particles?

• Light bounces off a white cement sidewalk.

• Light travels in space at a speed of about 3.0 x 10^8 m/s.

• Light bends as it strikes a window.

• Light increases in speed as it moves through matter.

Which statement correctly compares the speed of light?

• The speed of light in glass is faster than the speed of light through space.

• The speed of light in glass is much greater than 3 x 10^8 m/s.

• The speed of light in glass is slower than the speed of light through space.

• The speed of light through space is much greater than 3 x 10^8 m/s.

Which object absorbs the most visible light?

• a clear bowl

• a black t-shirt

• a white rock

• a red apple

Which of these will reflect light with the highest frequency?

• an orange basketball

• a blue candle

• a green ribbon

• a yellow banana

Which describes the changes in visible light moving from red to violet?

• The speed decreases.

• The wavelength increases.

• The energy increases.

• The frequency decreases.