4-29-24 Ch 12 sec 3

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.

• Uses the least amount of electricity to produce light.

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.

____ light is light of only one wavelength that travels in one direction with a constant distance between corresponding crests.

• Incoherent

• Coherent

• Incandescent

• Compact

____ light is light that can have more than one wavelength, can travel in more than one direction, and does not travel with a constant distance between the corresponding crests of the waves.

• Incoherent

• Coherent

• Incandescent

• Compact

What type of light bulb uses phosphors to convert ultraviolet radiation into visible light?

• incandescent light bulb

• fluorescent light bulb

• tungsten-halogen bulb

• neon light

_____ is a tube that contains a mixture of neon gas, a small amount of argon gas, and a small amount of sodium metal.

• incandescent light bulb

• sodium vapor light

• tungsten-halogen bulb

• neon light

_____ is a light that has a tungsten filament inside a quartz bulb or tube. The tube is filled with a gas that contains one of the halogen elements.

• incandescent light bulb

• sodium vapor light

• tungsten-halogen bulb

• neon light

About 90% of the energy is given off as thermal energy by which type of light bulb?

• Incandescent light bulb

• Sodium vapor light

• Tungsten-halogen bulb

• Neon light

These lights are glass tubes filled with gas often neon. When there is an electric current through the tube, electrons collide with the gas molecules and emit visible light. What are these lights called?

• Incandescent light bulb

• Sodium vapor light

• Tungsten-halogen bulb

• Neon light

Which of the following produces a narrow, intense beam of coherent light?

• Lasers

• Fluorescent bulbs

• Neon lights

• Tungsten-halogen lights