COLLEGE PHYSICS II FINAL EXAM WITH ALL CORRECT
& 100% VERIFIED ANSWERS|ACTUAL EXAM|LATEST
UPDATE|ALREADY GRADED A+
A light beam has speed c in vacuum and speed v in a certain plastic. The index of refraction n of this
plastic is ✔Correct answer-n = c/v
When a light wave enters into a medium of different refractive index, ✔Correct answer-only its
speed and wavelength change
In a single-slit diffraction experiment, the width of the slit through which light passes is reduced.
What happens to the width of the central bright fringe in the resulting diffraction pattern?
✔Correct answer-it becomes wider
Light of the same wavelength passes through two diffraction gratings. One grating has 4000 lines/cm,
and the other one has 6000 lines/cm. Which grating will spread the light through a larger angle in the
first-order pattern? ✔Correct answer-the 6000 line
When a beam of light that is traveling in glass strikes an air boundary at the surface of the glass,
there is ✔Correct answer-no phase change in the reflected beam
Light goes from material having a refractive index of n1 into a material with refractive index n2. If the
refracted light is bent away from the normal, what can you conclude about the indices of refraction?
✔Correct answer-n1 > n2
Which one of the following numbers is the correct magnification produced by a plane mirror?
✔Correct answer-1
Single concave spherical mirrors produce images that ✔Correct answer-could be smaller than,
larger than, or the same size as the actual object, depending on the placement of the object
Single convex spherical mirrors produce images that ✔Correct answer-are always smaller than the
actual object
Is it possible to see a virtual image? ✔Correct answer-Yes because the rays that appear to come
from a virtual image can be focused by the eye just like those from an object
What type of lens is used to make a magnifying glass? ✔Correct answer-converging
You have a choice between two lenses of focal lengths fa and fb, where fb = 2fa, to use as the
objective lens in building a compound microscope. If the magnification you obtain using lens a is Ma,
what will be the magnification when using lens b? ✔Correct answer-Mb = Ma/2
Chromatic aberration in lenses is due to the ✔Correct answer-dispersion of light by the lens
X and Y are two initially uncharged metal spheres on insulating stands, and they are in contact with
each other. A positively charged rod R is brought close to X. Sphere Y is now moved away from X.
What are the final charge states of X and Y? ✔Correct answer-X is negative and Y is positive
, Two uncharged metal spheres, #1 and #2, are mounted on insulating support rods. A third metal
sphere, carrying a positive charge, is then placed near #2. Now a copper wire is momentarily
connected between #1 and #2 and then removed. Finally, sphere #3 is removed. In this final state
✔Correct answer-sphere #1 carries positive charge and #2 carries negative charge
In outer space, a positive charge q is released near a positive fixed charge Q. As q moves away from
Q, what is true about the motion of q? ✔Correct answer-It will move with decreasing acceleration
and with increasing speed
Two point charges, Q1 and Q2, are separated by a distance R. If the magnitudes of both charges are
halved and their separation is also halved, what happens to the electrical force that each charge
exerts on the other one? ✔Correct answer-it remains the same
An electron is initially moving to the right when it enters a uniform electric field directed upwards, as
shown in the figure. Which trajectory (X, Y, Z, or W) will the electron follow in the field? ✔Correct
answer-down & to the right
A proton is accelerated from rest through a potential difference V0 and gains a speed v0. If it were
accelerated instead through a potential difference of 2V0, what speed would it gain? ✔Correct
answer-v0 * sqrt(2)
Two protons are released from rest, with only the electrostatic force acting. Which of the following
statements must be true about them as they move apart? ✔Correct answer-Their kinetic energy
keeps increasing, electric potential energy keeps decreasing, and acceleration keeps decreasing
An ideal parallel-plate capacitor has a capacitance of C. If the area of the plates is doubled and the
distance between the plates is halved, what is the new capacitance? ✔Correct answer-4C
A parallel-plate capacitor consists of a set of two parallel plates of area A separated by a distance d.
This capacitor is connected to a battery that maintains a constant potential difference across the
plates. A slab of a dielectric material is inserted in the region between the plates and completely fills
it. What changes would you observe as the dielectric is inserted? ✔Correct answer-Both the
charge on the plates of the capacitor and its capacitance would change
Which of the following changes will increase the capacitance of a parallel-plate capacitor?
✔Correct answer-introduce a dielectric material between the plates and decrease the separation
between the plates
Copper wire #1 has a length L and a radius b. Copper wire #2 has a length 2L and a radius 2b. Which
statement about the resistance across the ends of the wires is true? ✔Correct answer-The
resistance of wire #1 is twice as high as that of wire #2
The length of a certain wire is doubled and at the same time its radius is also doubled. What is the
new resistance of this wire? ✔Correct answer-it is 1/2 as large
When two or more different capacitors are connected in series across a potential source, which of
the following statements must be true? ✔Correct answer-The total voltage across the combination
is the algebraic sum of the voltages across the individual capacitors, Each capacitor carries the same
amount of charge, & The equivalent capacitance of the combination is less than the capacitance of
any of the capacitors
& 100% VERIFIED ANSWERS|ACTUAL EXAM|LATEST
UPDATE|ALREADY GRADED A+
A light beam has speed c in vacuum and speed v in a certain plastic. The index of refraction n of this
plastic is ✔Correct answer-n = c/v
When a light wave enters into a medium of different refractive index, ✔Correct answer-only its
speed and wavelength change
In a single-slit diffraction experiment, the width of the slit through which light passes is reduced.
What happens to the width of the central bright fringe in the resulting diffraction pattern?
✔Correct answer-it becomes wider
Light of the same wavelength passes through two diffraction gratings. One grating has 4000 lines/cm,
and the other one has 6000 lines/cm. Which grating will spread the light through a larger angle in the
first-order pattern? ✔Correct answer-the 6000 line
When a beam of light that is traveling in glass strikes an air boundary at the surface of the glass,
there is ✔Correct answer-no phase change in the reflected beam
Light goes from material having a refractive index of n1 into a material with refractive index n2. If the
refracted light is bent away from the normal, what can you conclude about the indices of refraction?
✔Correct answer-n1 > n2
Which one of the following numbers is the correct magnification produced by a plane mirror?
✔Correct answer-1
Single concave spherical mirrors produce images that ✔Correct answer-could be smaller than,
larger than, or the same size as the actual object, depending on the placement of the object
Single convex spherical mirrors produce images that ✔Correct answer-are always smaller than the
actual object
Is it possible to see a virtual image? ✔Correct answer-Yes because the rays that appear to come
from a virtual image can be focused by the eye just like those from an object
What type of lens is used to make a magnifying glass? ✔Correct answer-converging
You have a choice between two lenses of focal lengths fa and fb, where fb = 2fa, to use as the
objective lens in building a compound microscope. If the magnification you obtain using lens a is Ma,
what will be the magnification when using lens b? ✔Correct answer-Mb = Ma/2
Chromatic aberration in lenses is due to the ✔Correct answer-dispersion of light by the lens
X and Y are two initially uncharged metal spheres on insulating stands, and they are in contact with
each other. A positively charged rod R is brought close to X. Sphere Y is now moved away from X.
What are the final charge states of X and Y? ✔Correct answer-X is negative and Y is positive
, Two uncharged metal spheres, #1 and #2, are mounted on insulating support rods. A third metal
sphere, carrying a positive charge, is then placed near #2. Now a copper wire is momentarily
connected between #1 and #2 and then removed. Finally, sphere #3 is removed. In this final state
✔Correct answer-sphere #1 carries positive charge and #2 carries negative charge
In outer space, a positive charge q is released near a positive fixed charge Q. As q moves away from
Q, what is true about the motion of q? ✔Correct answer-It will move with decreasing acceleration
and with increasing speed
Two point charges, Q1 and Q2, are separated by a distance R. If the magnitudes of both charges are
halved and their separation is also halved, what happens to the electrical force that each charge
exerts on the other one? ✔Correct answer-it remains the same
An electron is initially moving to the right when it enters a uniform electric field directed upwards, as
shown in the figure. Which trajectory (X, Y, Z, or W) will the electron follow in the field? ✔Correct
answer-down & to the right
A proton is accelerated from rest through a potential difference V0 and gains a speed v0. If it were
accelerated instead through a potential difference of 2V0, what speed would it gain? ✔Correct
answer-v0 * sqrt(2)
Two protons are released from rest, with only the electrostatic force acting. Which of the following
statements must be true about them as they move apart? ✔Correct answer-Their kinetic energy
keeps increasing, electric potential energy keeps decreasing, and acceleration keeps decreasing
An ideal parallel-plate capacitor has a capacitance of C. If the area of the plates is doubled and the
distance between the plates is halved, what is the new capacitance? ✔Correct answer-4C
A parallel-plate capacitor consists of a set of two parallel plates of area A separated by a distance d.
This capacitor is connected to a battery that maintains a constant potential difference across the
plates. A slab of a dielectric material is inserted in the region between the plates and completely fills
it. What changes would you observe as the dielectric is inserted? ✔Correct answer-Both the
charge on the plates of the capacitor and its capacitance would change
Which of the following changes will increase the capacitance of a parallel-plate capacitor?
✔Correct answer-introduce a dielectric material between the plates and decrease the separation
between the plates
Copper wire #1 has a length L and a radius b. Copper wire #2 has a length 2L and a radius 2b. Which
statement about the resistance across the ends of the wires is true? ✔Correct answer-The
resistance of wire #1 is twice as high as that of wire #2
The length of a certain wire is doubled and at the same time its radius is also doubled. What is the
new resistance of this wire? ✔Correct answer-it is 1/2 as large
When two or more different capacitors are connected in series across a potential source, which of
the following statements must be true? ✔Correct answer-The total voltage across the combination
is the algebraic sum of the voltages across the individual capacitors, Each capacitor carries the same
amount of charge, & The equivalent capacitance of the combination is less than the capacitance of
any of the capacitors
