PSC 1121 - Chapter 7: LIGHT Questions and
Verified Answers
A scientist might model light as electromagnetic waves to understand how an
incandescent lightbulb works. She might model light as rays to Blank__________.
Correct Answer: - design the optics of a microscope
- understand the reflection from a glass window
An object that produces light is said to be ____________. Correct Answer: Blank 1:
luminous
Filament lightbulbs, the wires in a toaster, and a fire are all examples of
___________ light sources, which produce light over a wide range of wavelengths.
Correct Answer: Blank 1: incandescent
In the production of light by an incandescent source, internal heat moves particles
that make up the glowing object. The moving nuclei and electrons Blank______.
Correct Answer: disturb the electric and magnetic fields in the material, creating
electromagnetic radiation
Reason:
Accelerating charged particles create electromagnetic waves. The hotter the object,
the more acceleration occurs, and the more light is produced.
Visible light is only a small part of the entire ___________ spectrum, which is
shown in the figure. Correct Answer: Blank 1: electromagnetic
Match the model of light to what it can be used for. Correct Answer: -
Electromagnetic wave model --- Explain the generation of light at a source.
- Representing light as a ray ---- Predict the angle of a reflection off a mirror.
- Particle model ---- Explain light as individual packets of energy.
,Objects that are luminous ___________. Correct Answer: produce light
Rank the different types of electromagnetic radiation by their frequency, with the
lowest frequency on the top. Correct Answer: 1. Radio Waves
2. Infrared Light
3. Visible Light
4. Ultraviolet Light
5. X Rays
6. Gamma Rays
Select all the choices that are incandescent light sources. Correct Answer: - The Sun
- A candle
An animal or plant that is bioluminous can produce visible ____________. Correct
Answer: Blank 1: light
The light produced by incandescent light sources is generated by _____________.
Correct Answer: accelerating electric charges
True or false: All objects with heat produce blackbody radiation. Correct Answer:
True
Reason:
For objects at "room temperature," this radiation is mainly in infrared wavelengths,
so they do not appear to be glowing unless you use special cameras.
The figure shows the Blank______. Correct Answer: electromagnetic spectrum
, Select all that occur as the temperature of an object emitting blackbody radiation
increases. Correct Answer: - More light is produced.
- The peak of the emission shifts to bluer (shorter) wavelengths.
A scientist might model light as electromagnetic waves to understand how an
incandescent lightbulb works. She might model light as rays to Blank______.
Correct Answer: - understand the reflection from a glass window
- design the optics of a microscope
The temperature needed for an object to glow red is Blank__________ the
temperature needed for an object to glow white. Correct Answer: lower than
Match the type of electromagnetic radiation with its frequency and common use(s).
Correct Answer: - Microwaves ---- Lowest frequency; cellular phones, broadcast
television, cooking
- Infrared light ---- Second lowest frequency; remote controls, night-vision
equipment
- X rays ---- Second highest frequency; dental and medical imaging
- Gamma rays ---- Highest frequency; medical treatments
Plants and animals that emit visible light are said to be Blank______. Correct
Answer: bioluminous
Sunlight is primarily made up of Blank______ Correct Answer: infrared radiation
Incandescent light sources produce _____________ radiation, which is shown in
the graph. Correct Answer: Blank 1: blackbody
If you were designing a microscope or telescope, the _______________
_____________model would be helpful for tracing light's path through the device.
Correct Answer: Blank 1: light
Verified Answers
A scientist might model light as electromagnetic waves to understand how an
incandescent lightbulb works. She might model light as rays to Blank__________.
Correct Answer: - design the optics of a microscope
- understand the reflection from a glass window
An object that produces light is said to be ____________. Correct Answer: Blank 1:
luminous
Filament lightbulbs, the wires in a toaster, and a fire are all examples of
___________ light sources, which produce light over a wide range of wavelengths.
Correct Answer: Blank 1: incandescent
In the production of light by an incandescent source, internal heat moves particles
that make up the glowing object. The moving nuclei and electrons Blank______.
Correct Answer: disturb the electric and magnetic fields in the material, creating
electromagnetic radiation
Reason:
Accelerating charged particles create electromagnetic waves. The hotter the object,
the more acceleration occurs, and the more light is produced.
Visible light is only a small part of the entire ___________ spectrum, which is
shown in the figure. Correct Answer: Blank 1: electromagnetic
Match the model of light to what it can be used for. Correct Answer: -
Electromagnetic wave model --- Explain the generation of light at a source.
- Representing light as a ray ---- Predict the angle of a reflection off a mirror.
- Particle model ---- Explain light as individual packets of energy.
,Objects that are luminous ___________. Correct Answer: produce light
Rank the different types of electromagnetic radiation by their frequency, with the
lowest frequency on the top. Correct Answer: 1. Radio Waves
2. Infrared Light
3. Visible Light
4. Ultraviolet Light
5. X Rays
6. Gamma Rays
Select all the choices that are incandescent light sources. Correct Answer: - The Sun
- A candle
An animal or plant that is bioluminous can produce visible ____________. Correct
Answer: Blank 1: light
The light produced by incandescent light sources is generated by _____________.
Correct Answer: accelerating electric charges
True or false: All objects with heat produce blackbody radiation. Correct Answer:
True
Reason:
For objects at "room temperature," this radiation is mainly in infrared wavelengths,
so they do not appear to be glowing unless you use special cameras.
The figure shows the Blank______. Correct Answer: electromagnetic spectrum
, Select all that occur as the temperature of an object emitting blackbody radiation
increases. Correct Answer: - More light is produced.
- The peak of the emission shifts to bluer (shorter) wavelengths.
A scientist might model light as electromagnetic waves to understand how an
incandescent lightbulb works. She might model light as rays to Blank______.
Correct Answer: - understand the reflection from a glass window
- design the optics of a microscope
The temperature needed for an object to glow red is Blank__________ the
temperature needed for an object to glow white. Correct Answer: lower than
Match the type of electromagnetic radiation with its frequency and common use(s).
Correct Answer: - Microwaves ---- Lowest frequency; cellular phones, broadcast
television, cooking
- Infrared light ---- Second lowest frequency; remote controls, night-vision
equipment
- X rays ---- Second highest frequency; dental and medical imaging
- Gamma rays ---- Highest frequency; medical treatments
Plants and animals that emit visible light are said to be Blank______. Correct
Answer: bioluminous
Sunlight is primarily made up of Blank______ Correct Answer: infrared radiation
Incandescent light sources produce _____________ radiation, which is shown in
the graph. Correct Answer: Blank 1: blackbody
If you were designing a microscope or telescope, the _______________
_____________model would be helpful for tracing light's path through the device.
Correct Answer: Blank 1: light
