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Physic 2002 Conceptual Test Bank. Questions and Correct Answers.
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Physic 2002 Conceptual Test Bank.Questions and Correct Answers.
When you look at a single slit diffraction pattern produced on a screen by light of a single wavelength,
you see a bright central maximum and a number of maxima on either side, their intensity decreasing
with distance from the central maximum. If the width of the slit is decreased,
the pattern increases in size. (central maximum wider; other maxima farther from it)
When you look through a sheer curtain at a distant street lamp, you see a pattern of colored spots of
light. This occurs by
diffraction of light waves passing through the two dimensional pattern of openings between the threads.
Ellen says that whenever the acceleration is directly proportional to the displacement of an object from
its equilibrium position, the motion of the object is simple harmonic motion. Mary says this is true only if
the acceleration is opposite in direction to the displacement. Which one, if either, is correct?
Mary, because the second derivative of an oscillatory function like sin(ωt) or cos(ωt) is always
proportional to the negative of the original function.
. A student attaches a length of nylon fishing line to a fence post. She stretches it out and shakes the end
of the rope in her hand back and forth to produce waves on the line. The most efficient way for her to
increase the wavelength is to
. increase the tension on the hose and shake the end fewer times per second.
If you stand closer to a concave mirror than a distance of one focal length, the image you see is
virtual and upright
. When you stand in front of a convex mirror, the image you see is
virtual and upright
The image of an object beneath the surface of a medium of refractive index n > 1 is seen in air by a
person looking down on the surface. This image, formed by light rays leaving the flat refractive surface, is
virtual and closer to the viewer than the object
A magician can make a candle look as if it is burning under water by focusing light from a candle flame
burning in air directly on top of an underwater candle. To do this you want to use a (Hint: eliminate
those that cannot work.)
concave mirror farther than one focal length from the burning candle.
If a convex lens were made out of very thin clear plastic filled with air, and were then placed underwater
where n = 1.33 and where the lens would have an effective index of refraction n = 1, the lens would act
in the same way
, as a concave lens in air.
Ilona and Olivia observe a virtual image formed by an object placed a distance f/2 in front of a convex
lens of focal length f. They argue about where to place a concave lens of focal length −f to have a virtual
image at the same location relative to the lens that they had with the convex lens. Ilona says that the
object should also be placed a distance f/2 in front of the concave lens. Olivia says that this won't work.
Which one, if either, is correct, and why?
Olivia, because if q = −f, then p was p = ∞
Light behaves like
a wave at times and a particle at other times
A monochromatic (single frequency, single wavelength) light ray in air (n = 1) enters a glass prism (n =
1.5). In the glass prism
the frequency is the same, but the wavelength is smaller than in air.
When a light ray travels between any two points, the path it takes is the one that
takes the least time
Light can exhibit the characteristics of
a particle with energy E = hf and a wave with wavelength λ=(h*c)/E
When light is either reflected or refracted, the quantity that does not change in either process is its
frequency
The magnetic flux through a loop perpendicular to a uniform magnetic field will change
if the loop is rotated through 180 degrees about an axis through its center and in the plane of the loop.
A current may be induced in a coil by
moving one end of a bar magnet through the coil. AND
moving the coil toward one end of the bar magnet. AND
holding the coil near a second coil while the electric current in the second coil is increasing.
Coil 1, connected to a 100 Ω resistor, sits inside coil 2. Coil 1 is connected to a source of 60 cycle per
second AC current. Which statement about coil 2 is correct?
AC current (current flow in alternating directions) will be induced in coil 2
An induced emf is produced in
a closed loop of wire moving at constant velocity in a nonuniform static magnetic field
A bar magnet is dropped from above and falls through the loop of wire shown below. The north pole of
the bar magnet points downward towards the page as it falls. Which statement is correct
The current in the loop flows first in a counterclockwise, then in a clockwise direction
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