Which of the following colors could not be represented by a single wavelength of light?
Selected Answer: indigo
Correct Answer:
Question
2
... [Show More]
1 of 1 points
purple
In the electromagnetic spectrum, as the radiation changes from x-rays to visible light, the velocity
Selected Answer: stays the same
Correct Answer: stays the
same
Question
3
1 of 1 points
Which of the following is a part of the electromagnetic spectrum?
Selected Answer: infrared radiation
Correct Answer: infrared
radiation
Question
4
1 of 1 points
The signature of light is the
Selected Answer: wavelength
Correct Answer:
Question
5
1 of 1 points
wavelength
In the electromagnetic spectrum of visible light, the shortest wavelength is associated with violet, the longest with
Selected Answer: red
Correct Answer:
Question
6
1 of 1 points
red
Fluorescent lamps have mercury vapor which emits uv radiation. The tube is coated with phosphors which produce
Selected Answer: visible light
Correct Answer: visible
light
Question
7
0 of 1 points
White light incident on a flat mirror obeys the relation that the angle of incidence equals the angle of reflection. Doe
When an object emits light, the light from the object Selected Answer: travels in all directions
If you enlarge the pinhole, does the image Selected Answer: become
dimmer
If the Sun's light were to be extinguished at this moment, in what time would we know about it. (The distance to the Sun is 1.5 x 108 km)
Selected Answer: in some minutes
The distance to the Sun is 1.5 x 108 km, the moon is much closer. If the Sun's light were to be
extinguished at this moment, the reflected light from the moon would turn off
Selected Answer: in some minutes
A beam of blue light is traveling in glass and crosses into air. As the light crosses the boundary, which of the following occurs?
Selected Answer: a change in wavelength
You are in a foggy room with a flashlight looking for objects. You see the flashlight beam because the water particles
Selected Answer: reflect the
light
A beam of light in air is incident on a transparent glass plate (n=1.5) that is 1.0 cm thick. The angle of incidence is theta. Reflection occurs at the air/glass interface. Will reflection occur at the glass/air interface (the opposite side of the glass plate)?
Selected Answer: Yes
When you place a transparent glass object in an oil-filled container, the view of the object will disappear when the object and oil have:
Selected Answer: the indices of refraction matched
You are in a dark room with a flashlight looking for an object on a black wall. In order for you to see the object, it must
Selected Answer: reflect the
light
You are in a foggy room with a flashlight looking for an object on a black wall. In order for you to see the beam, it must
Selected Answer: reflect the
light
You can make a telescope with a convex lens and a
Selected Answer: concave lens
Ray tracing allows
Selected Answer: us to find the focal length
If you have a light source at a distance from a convex lens, the projected image on paper appears
Selected Answer: inverted
To find the focal length of a lens, you measure the distance from the lens to a point where Selected Answer: light from an overhead lamp comes to a sharp focus
If you have a light source a distance from a lens you project the image on a sheet of paper, the images appears inverted for a:
Selected Answer: convex lens
The magnification of a convex lens compared to a Fresnel lens: Selected Answer: can be the same
The major mechanism for the absorption (loss) of a photon is the "photoelectric" effect which is described by?
Selected Answer: an electron gaining energy from a photon.
Sound can be described as
Selected Answer: vibrations of air molecules
Compared to an electron a photon Selected Answer: can be destroyed
Microwaves are part of the electromagnetic spectrum. Compared to photons of visible light, a microwave has?
Selected Answer: all of the above
Photons with millions of electron Volts of energy can create Selected Answer: electrons
Light can be described as having wave-like behavior and Selected Answer: particle-like behavior
The word "photon" can be used to describe? Selected Answer: particle of light
Question 1 2 of 2 points
What colors are used in a T.V. color monitor?
Selected Answer: red, blue and
green
White light incident on a flat mirror obeys the relation that the angle of incidence equals the angle of reflection. Does red light incident on the mirror follow the same relation?
Selected Answer: Yes
The ultraviolet portion of the sun's spectrum Selected Answer: both of the above
In the electromagnetic spectrum, as the radiation changes from x-rays to visible light, the velocity
Selected Answer: decreases
When a pure blue object is illuminated with red light, the object appears Selected Answer: black
The water droplets in the clouds that sunlight is reflected from are
Selected Answer: many times larger than the wavelength of visible light
White clouds have many droplets that reflect the light so that the clouds scatter
Selected Answer: about half of the
light
The observer's shadow is the center of the arc of the Selected Answer: rainbow
If you observe a white-light flashlight by looking directly through a water-filled container that is milky colored with milk droplets, the flashlight color is
Selected Answer: yellow-red
When you look at a rainbow, compared to the sky inside the rainbow, the sky outside the rainbow appears
Selected Answer: darker
The amount of reflect light incident on two transparent materials depends on differences in Selected Answer: refractive indices
Compared to the dimensions of the wavelength of light,particles that preferentially scatter blue light are
Selected Answer: smaller
John Tyndall demonstrated that fine dust particles could lead to preferential scattering of Selected Answer: blue light
Light going from lower refractive index air to high refractive index glass has a phase change in the reflected beam of
Selected Answer: one-half wavelength
A single wavelength light beam incident on a thin film can have the reflected beam either reinforced diminished depending on
Selected Answer: all of the above
In polarized light, the photon carries away
Selected Answer: one unit of angular momentum
White light can be produced by two colors. Selected Answer: Yes
An unpolarized beam of light can be represented by two vector components of wave oscillations oriented
Selected Answer: parallel to each other
For light incident on water, is there a Brewster's Angle for fully polarized reflected light? Selected Answer: Yes
If you take two polarizer films that are transparent to light and you cross them by 90 degrees, the pair will
Selected Answer: remain transparent
In solid silicon the outermost electrons are bound by energies of 1.1 eV. Light is absorbed in Selected Answer: visible portion of the spectrum
In light emission, if the electrons have well-defined energy levels, you observe Selected Answer: line spectra
Light can be described by particle-like behavior or Selected Answer: wave-like behavior
If you use an optical spectrometer to observe an incandescent lamp you see Selected Answer: a broad spectrum from red to blue
The difference between infrared and visible light emission is that in infrared light
Selected Answer: energies are lower
Question 1 0 of 1 points
If you punched a second hole in the foil of the scope, how many images do you see in the viewer?
Selected Answer: one Correct Answer:
two
If we consider the hum eye as a pinhole camera with the image of a three projected on the back of the eye (the "retina"), the image would be
Selected Answer: inverted (upside down) Correct Answer: inverted (upside down)
Based on your experiences in the Activity, the pinhole scope images become less clear if you
Selected Answer: make three pinholes Correct Answer: enlarge the pinhole
If the Sun's light were to be extinguished at this moment, we would know about it
Selected Answer: in 8 minutes Correct Answer: in 8 minutes
Based on your experiences in the Activity, if you enlarge the pinhole, does the image
Selected Answer: remain unchanged? Correct Answer: become less clear?
If you punched three holes in the foil of the scope, how many images do you see in the viewer?
Selected Answer: one Correct Answer:
three
The velocity of light in water, compared to the velocity in air Selected Answer: is slower
Correct Answer: is slower
If you punched thousands of holes in the aluminum foil of the scope (so there were more "holes" than "foil"), how many imageswould you see in the viewer?
Selected Answer: one large blurry image Correct Answer: one large blurry image
The velocity of white light in a uniform transparent medium
Selected Answer: is constant for all colors Correct Answer: is constant for all colors
When you view an object with a pinhole scope, the object is inverted. If you rotate the scope 180 degrees, the image is
Selected Answer: still inverted Correct Answer: still inverted
Question 1 1 of 1 points
You are in a foggy room with a flashlight looking for an object on a black wall. In order for you to see the beam, it must
Selected Answer: reflect the
light
Correct Answer: reflect the
light
In the Bent Pencil Activity, the pencil appeared bent because
Selected Answer: the indices of refraction changed
Correct Answer: the indices of refraction changed
When a beam of light in air is incident on water, the energy does not change at the interface when the beam
Selected Answer: neither of the
above
Correct Answer: both the above
Question 1 of 1 points
4
A beam of red light is incident on a glass plate. Will the beam transmitted through the glass plate emerge parallel to the incident beam?
Selected Answer: Yes
Correct Answer: Yes
A beam of light in air passes the air/glass boundary. What does not change?
Selected Answer: energy Correct Answer: energy
Total internal reflection can occur when a beam of light
Selected Answer: in glass is incident on air Correct Answer: in glass is incident on air
A beam of light in air is incident on a transparent glass plate. Reflection occurs at the air/glass interface. Will reflection occur at the glass/air interface (the opposite side of the glass plate)?
Selected Answer: No
Correct Answer: Yes
When you place a transparent glass object in an oil-filled container, the view of the object will disappear when the object and oil have:
Selected Answer: the indices of refraction matched Correct Answer: the indices of refraction matched
A beam of light, containing many individual light beams, incident on a flat aluminum foil reflects from the mirror-like surface so that the angle of incidenceequals the angle of reflection. You wrinkle the foil. Would individual light beams obey the law of reflection in
this case?
Selected Answer: No
Correct Answer: Yes
A beam of blue light in air is incident on a glass plate. Will the transmitted beam emerge shifted laterally (sideways) from the direction of the incident beam?
Selected Answer: No
Correct Answer: Yes
Question 1 1 of 1 points
The weight of the lens is one advantage of using a Fresnel plastic lens of the same focal length over that of a:
Selected Answer: convex lens Correct Answer: convex lens
If you have two convex lenses with different curvatures, which has the shorter focal length?
Selected Answer: the lens with the greater curvature (more
rounded)
Correct Answer: the lens with the greater curvature (more
rounded)
If you have two convex lenses with different focal lengths, which has the smaller magnification?
Selected Answer: the lens with the larger focal length Correct Answer: the lens with the larger focal length
If you have two convex lenses with different curvatures, which has the longer focal length?
Selected Answer: the lens with the smaller curvature (less rounded) Correct Answer: the lens with the smaller curvature (less rounded)
A planar concave lens is a curved, circular glass that is
Selected Answer: flat on one side Correct Answer: flat on one side
If you have two different convex lenses with the same focal lengths and you focus the sun's light on a piece of paper, which causes the faster heating?
Selected Answer: the larger diameter lens Correct Answer: the larger diameter lens
Ray tracing allows
Selected Answer: us to see the path of light [Show Less]