Ch 12 Light

Optical fibers are _____ that can transmit light from one place to another.

• opaque glass fibers

• coherent beams

• transparent glass fibers
• filters acting as parallel slits

Which of the following light sources does not rely on the flow of an electric current through a gas to produce light?

• fluorescent light

• incandescent light

• neon light

• sodium-vapor light

Why does grass look green?

• It absorbs green light.

• It reflects green, and absorbs all the other colors.

• It reflects all color of light except green.

• It reflects all colors.

Which of the following colors of visible light has the longest wavelength?

• violet

• yellow

• red

• blue

A _____ is a colored material that absorbs some colors and transmits others.

• prism

• filter
• pigment

• laser

In a fluorescent light, electrons collide with atoms to produce .

• ultraviolet light

• gamma rays

• infrared light

• visible light

What happens when light travels from air into water at an angle to the normal?

• The light is refracted.

• The light changes color.

• The light is reflected.

• The light speeds up.

What makes a neon light glow?

• The filament is heated until it glows, producing light.

• Phosphors absorb ultraviolet light from gas molecules and begin to glow.

• The gas inside it is heated until it glows, producing light.

• Electrons collide with the gas molecules inside it and produce visible light.

Which of the following best describes an incandescent light?

• Gives off light when phosphors absorb ultraviolet radiation.

• Contains argon gas at low pressure.

• Gives off light when a tungsten filament is heated.

The part of the eye where light is focused is called the _____.

• retina

• pupil

• lens
• iris