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phys 222 final
Terms in this set (71)
The bending of a wavefront as it passes from one medium to another is called
If you hang 2 springs of the same strength together, will the resulting spring combo have a different spring constant than the individual springs?
The 2 together will be weaker, the k value will decrease
when traveling through air, sound bends toward ____ temperature
Speed of light in vacuum is 3 x 10^8. It enters a piece of glass with index of refraction 1.5. What is the lights speed inside the glass?
v = c/n so v is 2 x 10^8 m/s
compared to red light, the velocity of blue light in vacuum is
the same (all frequencies travel at the same speed in vacuum)
Wavelength and frequency are related by the equation lambda x f = v. What would the graph of log(lambda) vs log(f) look like
straight line of slope -1
A tube of length L is open at one end, closed at the other. What is the wavelength of the fundamental?
What image does a convex (converging) lens produce?
If you want to start a fire using sunlight, which kind of mirror would be most efficient?
concave mirror (can focus the light down to a point)
If a pendulum clock were brought to the moon it would run...
slower on the moon than on the earth
What happens to period of a simple pendulum with small amplitude and increasing length
If the amount an ideal spring is stretched from equilibrium doubles, the energy stores with the spring...
increases by a factor of 4
In order to increase the period of a simple pendulum, what would be the most effective?
increase the length
light that reflects off a horizontal surfaces is...
more likely to be polarized horizontally than vertically (because electrons jiggle more easily when parallel to the surface)
light of wavelength travels through a single slit and onto a screen behind it. A dark interference minimum appears on the screen. From this simple observation what can you conclude about the slit width D
D greater than wavelength
A capacitor is hooked up to a variable power supply, which is initially at 6V. Carissa then increases the voltage to 18V. When she does this, the capacitance...
stays the same (capacitance is a property of the capacitor, independent of the voltage) c = Q/V
suppose that at a given location in space, an electric field points due south. An electron at that location experiences a force...
suppose there exists a region of space in which there is an electric field pointing due south. There is a solid conducting sphere in a holder made of rubber bands. Brandy does the same with a hollow sphere. what statement is true?
electric field is zero inside both their spheres
Two positive charges are on the x axis. Is there a location I could place a negative charge and have it experience zero net force?
yes, there is a location somewhere between the 2 positive charges where the force would be zero
two capacitors connected in series..
have the same charge as each other
Two wires are identical, expect that one is longer than the other. What is true about their resistances?
the longer wire has greater resistance (bigger r means bigger R)
Set of 5 resistors, they connect each one across a battery, one at a time, and measure the current that flows. They plot current vs 1/R. What is the slope?
should get straight line of slope V
Two parallel wires carry electric currents. The currents may be unequal. You want there to be a spot directly between the two wires where the magnetic fields that they produce cancel. The currents should flow..
in the same direction
a pendulums clock is running fast, what can you do to fix this
lengthen the pendulum a bit
if an object exhibits repeated motion, the time for one complete oscillation is called the...
the spreading of a wave that occurs if the wave passes through an opening that is small compared with the waves wavelength is called
bending of a wave as due to a change in its speed or as it passes from one medium to another is called
stretched string of length L is fixed at both ends. the wavelength of a standing wave with 1 interior node is
when a light ray travels from water into air, it typically...
bends away from the normal
compared to red light, the velocity of blue light in vacuum is...
If 7 people singing made a sound level of 70 dB, what will be the sound level of 8 people
more than 70 but less that 75 dB
what image does a convex lens produce
real image when object is outside focal point, virtual image when object is inside focal point
for a diverging lens acting alone, we should expect the image to be...
virtual and on the same side of the lens as the object
for a converging lens with object inside the focal length, the image produced will be...
virtual, and on the same side of the lens as the object
total internal reflection is a phenomenon that can occur if light reaches a boundary where
the index of refraction decreases
the speed of light through a material with index of refraction n is...
If I have light of wavelength lambda incident a single slit of with D, I get a dark on the screen at an angle theta if...
If I have light incident on 2 narrow slits a distance d apart, parallel rays that emerge at an angle theta have a PDL of
If light traveling in air reflects straight back off a glass surface, it undergoes a phase shift of...
Suppose two charged particles a distance d apart attract each other with force F. What is the force if the distance is doubles to 2d?
Two positive charges q1 and q2 are a distance d apart. Is there a location somewhere between them where I could place a third (nonzero) charge q3 and not have q3 experience a net electric force?
In a static situation, what is the elcetric field inside a conductor?
Suppose you have an isolated positive point charge. In the vicinity of the charge, the electric field lines...
point radially away from the charge
the electric field at the surface of a conductor must be...
perpendicular to the surface
The angle between electric field lines and equipotential curves is always...
How are capacitance C of parallel plates, charge Q on the plates, and voltage difference V across the plates related?
C = Q/V
property of a material
depends on what material we have and the size/geometry of the object
Two capacitors C1 and C2 are connected in parallel. What is the capacitance of the combination?
C1 + C2
equations for power
P = I^2R or P = IV
Two charges q1 and q2 are a distance r apart. The total electrical potential energy is...
k q1 q2 / r
Kirchhoff's junction rule
total current into a junction = total current out of a junction
severity of shock -- would you rather be in series or parallel with a resistance if shocked by it?
A charge flows from the positive terminal of a 6V battery, through a lightbulb, into the negative terminal of the battery, and (finally) through the battery back to the positive terminal. What is the net change in voltage experienced by this charge?
An initially uncharged capacitor C is placed in a circuit with an open switch, a Resistor R, and a power supply V, so that when the switch is closed the capacitor charges. Betty wants the capacitor to charge quickly, and wonders if increasing the voltage V would make the capacitor charge more quickly. what say you?
no, increasing the voltage won't help
A bird can land on a power-line wire that's 240V AC and not get electrocuted. Why?
Because the birds feet are in parallel with a short section of wire, and there is very little voltage difference from one foot to the next. Hence, very little current flows through the bird.
A current of 1.0A flows through a standard 1.5 V battery. The internal resistance of the battery is 0.10 ohm. At what rate is thermal energy produced in the battery?
If you were asked to draw magnetic field lines surrounding a bar magnet, you'd draw lines:
that would start at the north-seeking pole and end at the south-seeking pole
A proton is traveling due north through a region of space in which the magnetic field is straight down. The magnetic force on the proton is
A neutron is traveling due north through a region of space in which the magnetic field is straight down. The magnetic force on the neutron is
A positively charged particle is traveling due east when it enters a region where there is a magnetic field B point straight down. Tessa wants the particle to travel straight through in a straight line, and so turns on an electric field. What should be the magnitude and direction of the electric field?
E = vB south
A charged particle is traveling in a region of uniform magnetic field. If no forces other than the magnetic force act, the motion of the particle will be: (Allow for velocity with components both parallel and perpendicular to the magnetic field.)
Whose law states that a current produced by a change in magnetic flux produces a new magnetic field that opposes the change in flux that induced the current?
Two parallel wires carry electric currents. The currents may be unequal. You want there to be a spot directly between the two wires where the magnetic fields that they produce cancel. The currents should flow:
in the same direction
A capacitor is hooked up to a variable power supply, which is initially at 6 V. Carissa then increases the voltage to 18 V. When she does this, the capacitance
stays the same
Benny has a green laser. Betty has a red laser. The both shine their lasers through a diffraction grating onto a screen, and both see a central bright spot plus at least one bright spot on each side of that central spot. Whose bright spots are closer together on the screen? (They are using the same grating.)
Benny's green dots are closer together
A coiled extension cord rests on the floor of a garage. It's plugged into itself, so that it makes a complete circuit. Beatrice considers the coiling to be of too small a radius, so she pushes sides of the coil apart and makes it bigger. She is in the northern hemisphere where the earth's magnetic field points (magnetic) north and downward. As she does this a current flows. What is the direction of the current flow?
counterclockwise as seen from above
Bert and Henrietta have a coil of wire in a magnetic field. They hook it up to a battery, run a current through the coil, and it begins to spin! It's similar to what we did in lab. Bert says, "My physics teacher says that when a coil spins like this in a magnetic field a "motional EMF" is generated. I wonder what the direction of that EMF is."
opposite the current flow
Suppose that at a given location in space, an electric field points due south. An electron at that location experiences a force
Suppose there exists a region of space in which there is an electric field pointing due south. Barney has a solid conducting sphere which he carefully suspends in a holder made of rubber bands. Brandy does the same with a hollow sphere. What statement is true?
the electric field is zero inside both their spheres
Bridget has a polarizer, which she points at the sky. It's a bright sunny day and the sky is bright blue. She looks in particular at the part of the sky at 90 degrees from the sun. (So, light could travel from sun, hit an air molecule in the sky, then come off at 90 degrees from its original direction and travel to Bridget.) For specificity, let's just suppose that the sun is due south of Bridget. When Bridget looks through the polarizer she discovers:
the light is strongly polarized in an EW direction
Recommended textbook explanations
University Physics Volume 1
Jeff Sanny, Samuel J Ling, William Moebbs
University Physics Volume 2
Jeff Sanny, Samuel J Ling, William Moebbs
University Physics (Volume 3)
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