12.3 Producing Light Section Questions

A light generated by heating a piece of metal until it glows is known as ?

• Coherent Light

• incandescent light

• Incoherent light

• Fluorescent light

This type of light is generated by using phosphors to convert ultraviolet radiation to visible light.

• Coherent Light

• Incandescent Light

• Incoherent Light

• Fluorescent Light

____ is light only one wavelength that travels in on direction with a constant distance between the corresponding crest of the waves.

• Coherent Light

• Incandescent Light

• Incoherent Light

• Fluorescent Light

____ 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.

• Coherent light

• Incandescent light

• Incoherent light

• Fluorescent light

What are the two main types of bulbs found in your home?

• Incandescent Lights

• Ultra violet Lights

• Fluorescent Lights

• Strobe Lights

Mark any of the advantages of using a fluorescent bulb instead of incandescent bulb.

• They Last Longer

• They are brighter

• They use more energy

• They use Less energy

Identify any uses of a laser

• Read CD's

• Use in Surgery

• In light Shows

• As a pointer

If 80 percent of the energy emitted by an incandescent bulb is thermal energy, how much thermal energy is emitted by a 75-W bulb in one second?

• 60 J

• 54 J

• 66.7 J

• 6.7 J

A 25 W fluorescent light emits 5.0J of thermal energy each second. What is the efficiency of the Fluorescent light?

*Hint ( Energy out / Energy in x 100 for percent)

• 20%

• 120%

• 80%

• 50%

What is a part of the body that lasers are commonly used for surgery?

• Hands

• Hamstrings

• Ears

• Eyes