WorksheetsCO4 - CO6 Finals Reviewer
Total questions: 67
Worksheet time: 1hrs 7mins
A light ray reflects from a surface. If the angle of incidence is 24°, what is the angle between the reflected ray and the incident ray at the surface?
24°
12°
48°
66°
A small object is encased in an acrylic block (n = 1.5). The object appears to be 4.0 cm below the surface. What is the actual distance of the object below the surface?
6.0 cm
5.5 cm
4.0 cm
2.7 cm
In a camera, the image focused on the film is
real and upright.
real and inverted.
virtual and upright.
virtual and inverted.
A convex mirror has a radius of 10 cm. What is its focal length?
10 cm
5.0 cm
−5.0 cm
−10 cm
A mirror has a focal length −20 cm. If an object is placed 10 cm in front of the mirror, where will the image form?
20 cm in front of the mirror
20 cm behind the mirror
6.7 in front of the mirror
6.7 behind the mirror
A 6.0 cm tall object is placed 20 cm in front of a convex mirror with focal length −100 cm. Where is the image formed?
80 cm behind the mirror
25 cm behind the mirror
17 cm behind the mirror
17 cm in front of the mirror
A 6.0 cm tall object is placed 20 cm in front of a convex mirror with focal length −100 cm. What is the size of the image formed?
5.0 cm
7.2 cm
7.5 cm
30 cm
A 6.0 cm tall object is placed 20 cm in front of a convex mirror with focal length −100 cm. Which of the following describes the image?
real and inverted
real and upright
virtual and inverted
virtual and upright
A 9.0 cm object is placed in front of a mirror and the image formed is upright, behind the mirror, and 3.0 cm in size. Which of the following statements is true?
the magnification is 1/3 and the image is real
the magnification is −1/3 and the image is real
the magnification is 1/3 and the image is virtual
the magnification is −1/3 and the image is virtual
An object is placed 60 cm in front of a mirror and the image is upright and ¼ the size of the object. What is the focal length of the mirror?
−12 cm
−20 cm
−45 cm
−75 cm
A concave mirror has an object placed 40 cm in front of it. An image forms 60 cm in front of the mirror. What is the focal length of the mirror?
60 cm
120 cm
100 cm
24 cm
A concave mirror has a 12 cm tall object placed 40 cm in front of it. An image forms 60 cm in front of the mirror. What is the size and orientation of the image?
8.0 cm, inverted
8.0 cm, upright
18 cm, inverted
18 cm, upright
A 25 cm focal length mirror has a 3.0 cm tall object placed 20 cm in front of it. Where is the image, and is it real or virtual?
5.0 cm behind the mirror, virtual
11 cm in front of the mirror, real
100 cm in front of the mirror, real
100 cm behind the mirror, virtual
Which of these statements is true for the image formed by a spherical mirror?
Real images are always inverted.
Virtual images of real objects are always in front of the mirror.
Virtual images of real objects are always upright.
Real images are always behind the mirror.
A 25 cm focal length mirror has a 3.0 cm tall object placed 20 cm in front of it. What is the size of the image and is it upright or inverted?
1.0 cm, upright
3.8 cm, inverted
2.4 cm, inverted
15 cm, upright
Which of these statements is true for the image formed by an object placed in front of a thin lens?
Convex lenses never produce virtual images.
Real images are always enlarged.
Real images are always inverted.
Virtual images are always inverted.
A point-like object is placed at the focal point of a converging lens, so the light rays emerging from the lens will be parallel to the principal axis. The object is now moved closer to the lens. Which statement is true about the light rays from the lens?
They will remain parallel to the principal axis.
They converge toward each other.
They emerge parallel to each other but not to the principal axis.
They diverge from each other.
A thin lens of focal length 12.5 cm has a 5.0 cm tall object placed 10 cm in front of it. Where will the image be formed?
50 cm in front of the lens
50 cm behind the lens
5.6 cm in front of the lens
5.6 cm behind the lens
A thin lens of focal length 12.5 cm has a 5.0 cm tall object placed 10 cm in front of it. What are the size and orientation of the image?
8.9 cm, upright
8.9 cm, inverted
25 cm, upright
4.0 cm, upright
A thin lens of focal length −12.5 cm has a 5.0 cm tall object placed 10 cm in front of it. Where is the image located?
5.6 cm in front of the lens
5.6 cm behind the lens
50 cm behind the lens
50 cm in front of the lens
A thin lens of focal length −12.5 cm has a 5.0 cm tall object placed 10 cm in front of it. What are the size and orientation of the image?
2.8 cm, inverted
2.8 cm, upright
4.0 cm, upright
4.0 cm, inverted
A building 30 m tall is being photographed with a camera with a lens of focal length 50 mm. How tall is the image if the building is 100 m away?
10 mm
15 mm
30 mm
3.0 mm
A lens of focal length f is used to project an image of a solar eclipse onto a flat sheet of paper. To get the clearest image, how far from the lens should be paper be?
f
f/2
more than 10f
less than f/10
When projected through a single lens, the image of a movie on a screen is
real and upright.
virtual and inverted.
real and inverted.
virtual and enlarged.
In order to produce an image twice the size of an object with a converging lens of focal length f, what object distance should be used?
2f
3f/2
2f/3
f/2
A coin has been dropped inadvertently into a bucket full of cleaning fluid (n=1.13). The bottom of the bucket is 15 cm below the surface. How far beneath the surface does the coin appear to be?
13.3 cm
17.0 cm
7.5 cm
More information is needed
A fish looking straight upward spots a berry on a tree branch above the surface of a pond. The fish is at rest 15 cm below the surface, while the berry is positioned 1.5 m above the surface. The index of refraction of water is 1.33. How far away does the berry appear to be from the fish’s perspective?
2.0 m
2.15 m
1.65 m
1.5 m
Two vertical plane mirrors are joined at a right angle. A horizontal beam of light is shone on one of the mirrors at an angle of incidence of 22 degrees, such that the reflected ray strikes the other mirror. What is the angle of incidence of the beam that strikes the second mirror?
23o
68°
43o
22o
An object placed farther from a converging lens than the focal point always produces an image that is
the same size as the object.
smaller than the object.
inverted.
virtual.
An object placed closer to a converging lens than the focal point always produces an image that is
the same size as the object.
smaller than the object.
virtual.
inverted.
The image of a real object formed by a diverging lens is always
virtual.
inverted.
real.
larger than the object.
You are conducting an experiment with a converging lens and have set it up to produce a real image of a distant tree. If you cover the top half of the lens with opaque paper, what occurs?
The bottom half of the image is missing.
The image becomes half as large.
The image is complete, but dimmer than it was.
The top half of the image is missing.
Of the following distances, which is the closest an object can be to a lens of focal length f and still produce a real image? (Note this is not the smallest possible distance, just the smallest of the provided choices.)
1.2f
0.8f
2f
3f
If an object is placed before a single thin lens
real images are always enlarged.
virtual images are always inverted.
real images are always inverted.
convex lenses never create virtual images.
A negative ion is moving east near the equator where the Earth's magnetic field is horizontal to the north. The direction of the magnetic force on the ion is
up.
down.
south.
north.
Find the force (magnitude and direction) exerted on an electron moving vertically upward at a speed of 2.0 × 107 m/s by a horizontal magnetic field of 0.50 T directed north.
1.6 × 10−12 N east
1.6 × 10−12 N west
1.8 × 10−12 N west
1.8 × 10−12 N east
The magnetic forces exerted on each other by two parallel wires with unequal currents flowing in opposite directions are
repulsive and unequal in magnitude.
attractive and unequal in magnitude.
repulsive and equal in magnitude.
attractive and equal in magnitude.
A straight wire is carrying a current upward. Observed from above (i.e., looking downward towards the wire), the magnetic field lines are
radially outward.
radially inward.
clockwise circles.
counter-clockwise circles.
If the magnetic field from a long, straight, current-carrying wire has a magnitude B0 at a distance d, what is the magnitude of the field at a distance 2d?
also B0
B0/2
B0/4
0.693 B0
A power line carries 1000 A at a height of 20 m above the ground. What is the resulting magnetic field at ground level?
5.0 μT
10 μT
13 μT
50 mT
Two parallel wires are each carrying 10 A and are separated by 4.0 m. If the currents are in opposite directions, what is the magnitude of the magnetic field halfway between them?
2.0 μT
4.0 μT
1.4 μT
1.0 μT
Two parallel wires run in a north-south direction. The eastern wire carries 15.0 A southward while the western wire carries 6.0 A northward. If the wires are separated by 30 cm, what is the magnitude of the magnetic field at a point between the wires 10 cm from the western wire?
15 μT
27 μT
6.0 μT
3.0 μT
Two long straight wires each carry a current of 12 A. One wire lies on the x-axis with its current in the positive x-direction. The other wire lies on the y-axis with its current in the positive y-direction. In the x-y plane, which quadrant (quadrants) has/have points where the magnetic field is zero?
I
II
II and IV
I and III
One wire, lying on the x-axis, carries a current of 8.0 A in the positive x-direction. Another wire, lying on the y-axis, carries a current of 12 A in the positive y-direction. What is the magnitude of the magnetic field at (x, y) = (8.0 cm, 12.0 cm)?
3.0 × 10−5 T
4.0 × 10−10 T
4.3 × 10−5 T
1.7 × 10−5 T
Two concentric circular wire loops in the same plane each carry a current. The larger loop has a current of 8.46 A circulating clockwise and has a radius of 6.20 cm. The smaller loop has a radius of 4.42 cm. What is the magnitude and direction of the current in the smaller loop if the total magnetic field at the center of the system is zero?
6.03 A CCW
6.03 A CW
12.8 A CCW
12.8 A CW
The magnetic field lines inside a bar magnet go in what direction?
from south pole to north pole
from north pole to south pole
from side to side
There are no magnetic field lines inside a bar magnet.
A proton and electron, each travelling with the same velocity, enter a region of uniform magnetic field. They experience
forces in the same direction and having ratio Fp/Fe = me/mp.
forces equal in magnitude, but opposite in direction.
forces opposite in direction and having ratio Fp/Fe = me/mp.
the same force.
A proton and electron, travelling with the same velocity in the +x direction, enter separate regions, each with a uniform magnetic field in the ±y direction (magnitude Bp for the proton, Be for the electron). They each experience the same acceleration. What can we conclude?
The magnetic fields were in the opposite direction and have ratio Bp/Be = mp/me.
The magnetic fields were in the opposite direction and have ratio Bp/Be = me/mp.
The magnetic fields were identical in magnitude and direction.
The magnetic fields were in the same direction and have ratio Bp/Be = me/mp.
A metal rod of length L moves with velocity v, perpendicular to its length, in a magnetic field B, which is perpendicular to both the rod and its velocity. If the length of the rod is doubled, what happens to the electric field in the rod?
It stays the same.
It doubles.
It quadruples.
It halves.
A metal rod of length 2.0 m is moved at 6.0 m/s in a direction perpendicular to its length. A 5.0 mT magnetic field is perpendicular to both the rod and its velocity. What is the magnitude of the electric field in the rod?
12 mV/m
60 mV/m
30 mV/m
15 mV/m
A metal rod of length 2.0 m is moved at 6.0 m/s in a direction perpendicular to its length. A 5.0 mT magnetic field is perpendicular to both the rod and its velocity. What is the potential difference between the ends of the rod?
60 mV
12 mV
30 mV
15 mV
A metal rod of length 2.0 m is moved at 6.0 m/s in a direction perpendicular to its length. A 5.0 mT magnetic field is perpendicular to both the rod and its velocity. What is the magnetic flux swept through per second by the rod?
12 mT·m2
15 mT·m2
60 mT·m2
30 mT·m2
A metal rod of length 2.0 m is moved at 6.0 m/s in a direction perpendicular to its length. A 5.0 mT magnetic field is perpendicular to both the rod and its velocity. If the resistance of the rod is 15 mΩ, what is the current in the rod?
0.0 A
2.0 A
4.0 A
8.0 A
A conducting rod is free to slide on horizontal metal rails without friction. At a particular time, it is sliding with velocity v to the right. A uniform magnetic field B is directed into the page, the separation of the rails is L, and the resistance of the circuit is R. In what direction is the current flowing in the resistor at this time?
UP
DOWN
up then down
down then up
A 20 turn coil of area 10 cm2 is placed in a magnetic field so that the normal to the coil’s area is in the same direction as the field. If the magnitude of the field increases from 0.25 T to 0.35 T in 2.0 s, what is the average emf induced in the coil?
7.0 mV
2.0 mV
1.0 mV
3.5 mV
Suppose an emf is induced in a loop of wire by rotating the loop in a magnetic field. If the diameter of the loop were twice as large, how would the induced emf compare?
The induced emf would be 4 times as much.
The induced emf would be twice as much.
There would be no change in the induced emf.
The induced emf would be 6.28 times as much.
A coiled loop of wire is in the field region between the poles of an electromagnet, with the axis of the coil aligned with the magnetic field. Which of the following things would NOT result in an induced EMF in the coil?
Pulling the coil partly out of the field region
Increasing or decreasing the current in the electromagnet
Rotation of the coil about an axis perpendicular to the coil axis
None of these choices will work.
The induced emf in a straight segment of wire that moves through a region with a magnetic field depends on all of the following, except
the orientation of the wire with respect to the magnetic field direction.
the length of the wire.
the resistance of the wire.
speed of the wire.
A loop of wire is moved through a region of uniform magnetic field. As it is moved, its orientation with respect to the magnetic field direction does not change. The induced current in the loop
depends on the shape of the loop.
depends on the magnitude of the field.
depends on the speed with which it is moved.
is zero.
A horse and rider travel in a region in which the vertical component of the Earth’s magnetic field is 0.035 mT, while the horizontal component is 0.022 mT. Attached to the horse’s bridle is a metal bit, a horizontal cylinder approximately 15 cm long, in the horse’s mouth. If the horse is galloping at 15 m/s, what is the induced potential difference between the ends of the bit?
79 µV
93 µV
50 µV
93 mV
Which of the following is a postulate of special relativity?
E0 = mc2.
Energy is conserved.
Momentum is conserved.
The laws of physics are the same in all inertial reference frames.
The principle of relativity states that
the Earth is a noninertial reference frame.
the speed of light in vacuum is constant.
the laws of physics are the same in all inertial reference frames.
Newton's second law does not hold at high speeds.
Which of the following is the best definition of inertial frame?
a frame of reference in which relativistic mechanics holds true, but Newtonian mechanics does not
a frame of reference in which there are no accelerations without applied forces
a frame of reference in which Newton's second and third laws hold, but not the first
a frame of reference in which Newtonian mechanics holds true, but relativistic mechanics does not
Which best describes the proper time interval between two events?
the longest interval measured by any inertial observer
the interval measured in the inertial reference frame in which the two events occur a maximum distance from each other
the interval measured in an inertial reference frame in which the two events are simultaneous
the interval measured in an inertial reference frame in which the two events occur at the same place
A passenger is on a spaceship traveling at 0.8 c. The passenger observes that her watch
is running slow.
is running fast.
is keeping time as usual.
is running slow if the ship is traveling in the positive direction.
Relative to a stationary observer, a moving clock
always runs slower than normal.
always runs faster than normal.
keeps its normal time.
Any of these choices could be correct depending on the relative velocity.
Two observers will always agree on
the speed of light.
the speed of sound.
the lengths of objects.
the lifetime of cosmic ray muons.
