PSC 1121 - Chapter 7: LIGHT Questions With Complete
SOLUTIONS
A concave mirror Blank______. Correct Answers - of the right
curvature will create a magnified virtual image
- of the right curvature will create a real image
- is bowl-shaped, with the inside lower than the edges
A galaxy is moving away from our home galaxy of the Milky
Way at 25 percent the speed of light. If an astronomer measured
the speed of light emitted by that galaxy, it would be
Blank______ 3.00 × 108 m/s. Correct Answers equal to
Reason:
The speed of light in empty space has the same value for all
observers, regardless of their velocity.
A hot object (such as an electric burner) starts to glow red when
the temperature reaches Blank______. An incandescent
lightbulb (tungsten filament) glows yellow-white at a
temperature of about Blank______. (Select two.) Correct
Answers - 2,200°C (4,000°F)
- 700°C (1,300° F)
A mirage of a lake in the desert or of a car's reflection on a hot
road happens because Blank______. Correct Answers light rays
in hot air traveling parallel or toward the ground are bent
upward at you when they encounter colder air higher up
,A mirror exhibits perfect reflection, as shown for object A. The
reflection from object B is an example of __________
reflection. Correct Answers diffuse
A radioactive particle moving at close to the speed of light takes
longer to decay than a stationary sample in a lab. This is an
example of how Blank___________ in the special theory of
relativity. Correct Answers moving clocks run more slowly
A rainbow is a(n) _____________ of color, not a straight line,
because the light refracted from each raindrop to your eye
maintains a constant angle. Correct Answers Blank 1: arc
A rainbow is made of arcs of color rather than straight lines
because Blank______. Correct Answers the arc of a given color
defines a constant angle between you, the raindrops, and the Sun
Reason:
The light you see from any one raindrop is a specific color—
whichever one is dispersed in your direction.
A scientist might model light as electromagnetic waves to
understand how an incandescent lightbulb works. She might
model light as rays to Blank__________. Correct Answers -
design the optics of a microscope
- understand the reflection from a glass window
A scientist might model light as electromagnetic waves to
understand how an incandescent lightbulb works. She might
model light as rays to Blank______. Correct Answers -
understand the reflection from a glass window
,- design the optics of a microscope
A train is traveling along the tracks at 20 km/h to the west
compared to Earth. Match the measured velocities of the train to
observers in different reference frames. Correct Answers - 20
km/h west --- At the train station
- 10 km/h west ---- In a car traveling 10 km/h to the west
compared to Earth
- 20 km/h east --- In a car traveling 40 km/h to the west
compared to Earth
An animal or plant that is bioluminous can produce visible
____________. Correct Answers Blank 1: light
An object that produces light is said to be ____________.
Correct Answers Blank 1: luminous
An orange light has a wavelength of 6.0 × 10-7 m, and an
ultraviolet light has a wavelength of 2.0 × 10-7 m. The
frequency of the ultraviolet light must be Blank______ as the
frequency of the orange light. (They are traveling in the same
medium.) Correct Answers three times as much
Reason:
The shorter wavelength light has a higher frequency by the same
factor, because c = λf.
Arrange the colors of visible light from the longest wavelength
(top) to the shortest (bottom).
Position 1 of 6 Red correct toggle button unavailable
Red Correct Answers ROYGBIV
red
, orange
yellow
green
blue
violet
Arrange these colors of visible light from the highest frequency
(top) to the lowest frequency (bottom). Correct Answers 1. blue
2. green
3. yellow
4. red
At what time of day would you expect the most glare off a lake
next to the highway? Correct Answers mid-sunrise
Click and drag on elements in order
Arrange the steps to explain Newton's experiment with sunlight
(white light), with the first at the top and the last at the bottom.
Correct Answers 1. Sunlight falls on a prism.
2. The light is dispersed into a rainbow of colors.
3. The light then falls on a second prism.
4. The prism combines the rainbow into white light.
Click and drag on elements in order
Rank the following substances based on how much light will
bend (refract), assuming it enters each at the same angle. Put the
substance with the most refraction at the top. Correct Answers
1. diamond
2. glass
SOLUTIONS
A concave mirror Blank______. Correct Answers - of the right
curvature will create a magnified virtual image
- of the right curvature will create a real image
- is bowl-shaped, with the inside lower than the edges
A galaxy is moving away from our home galaxy of the Milky
Way at 25 percent the speed of light. If an astronomer measured
the speed of light emitted by that galaxy, it would be
Blank______ 3.00 × 108 m/s. Correct Answers equal to
Reason:
The speed of light in empty space has the same value for all
observers, regardless of their velocity.
A hot object (such as an electric burner) starts to glow red when
the temperature reaches Blank______. An incandescent
lightbulb (tungsten filament) glows yellow-white at a
temperature of about Blank______. (Select two.) Correct
Answers - 2,200°C (4,000°F)
- 700°C (1,300° F)
A mirage of a lake in the desert or of a car's reflection on a hot
road happens because Blank______. Correct Answers light rays
in hot air traveling parallel or toward the ground are bent
upward at you when they encounter colder air higher up
,A mirror exhibits perfect reflection, as shown for object A. The
reflection from object B is an example of __________
reflection. Correct Answers diffuse
A radioactive particle moving at close to the speed of light takes
longer to decay than a stationary sample in a lab. This is an
example of how Blank___________ in the special theory of
relativity. Correct Answers moving clocks run more slowly
A rainbow is a(n) _____________ of color, not a straight line,
because the light refracted from each raindrop to your eye
maintains a constant angle. Correct Answers Blank 1: arc
A rainbow is made of arcs of color rather than straight lines
because Blank______. Correct Answers the arc of a given color
defines a constant angle between you, the raindrops, and the Sun
Reason:
The light you see from any one raindrop is a specific color—
whichever one is dispersed in your direction.
A scientist might model light as electromagnetic waves to
understand how an incandescent lightbulb works. She might
model light as rays to Blank__________. Correct Answers -
design the optics of a microscope
- understand the reflection from a glass window
A scientist might model light as electromagnetic waves to
understand how an incandescent lightbulb works. She might
model light as rays to Blank______. Correct Answers -
understand the reflection from a glass window
,- design the optics of a microscope
A train is traveling along the tracks at 20 km/h to the west
compared to Earth. Match the measured velocities of the train to
observers in different reference frames. Correct Answers - 20
km/h west --- At the train station
- 10 km/h west ---- In a car traveling 10 km/h to the west
compared to Earth
- 20 km/h east --- In a car traveling 40 km/h to the west
compared to Earth
An animal or plant that is bioluminous can produce visible
____________. Correct Answers Blank 1: light
An object that produces light is said to be ____________.
Correct Answers Blank 1: luminous
An orange light has a wavelength of 6.0 × 10-7 m, and an
ultraviolet light has a wavelength of 2.0 × 10-7 m. The
frequency of the ultraviolet light must be Blank______ as the
frequency of the orange light. (They are traveling in the same
medium.) Correct Answers three times as much
Reason:
The shorter wavelength light has a higher frequency by the same
factor, because c = λf.
Arrange the colors of visible light from the longest wavelength
(top) to the shortest (bottom).
Position 1 of 6 Red correct toggle button unavailable
Red Correct Answers ROYGBIV
red
, orange
yellow
green
blue
violet
Arrange these colors of visible light from the highest frequency
(top) to the lowest frequency (bottom). Correct Answers 1. blue
2. green
3. yellow
4. red
At what time of day would you expect the most glare off a lake
next to the highway? Correct Answers mid-sunrise
Click and drag on elements in order
Arrange the steps to explain Newton's experiment with sunlight
(white light), with the first at the top and the last at the bottom.
Correct Answers 1. Sunlight falls on a prism.
2. The light is dispersed into a rainbow of colors.
3. The light then falls on a second prism.
4. The prism combines the rainbow into white light.
Click and drag on elements in order
Rank the following substances based on how much light will
bend (refract), assuming it enters each at the same angle. Put the
substance with the most refraction at the top. Correct Answers
1. diamond
2. glass
