Physics 1251 Practice Final 2 1) A positive point charge q is placed off center inside an uncharged metal sphere insulated from the ground as shown. Where is the induced charge density greatest in magnitude and what is its sign? a. A; negative. b. A; positive. c. B; negative. d. B; positive. e. C; negative. 2) Light bulb A is rated at 60 W and light bulb B is rated at 100 W. Both are designed to operate at 110 V. Which statement is correct? a. The 60 W bulb has a greater resistance and greater current than the 100 W bulb. b. The 60 W bulb has a greater resistance and smaller current than the 100 W bulb. c. The 60 W bulb has a smaller resistance and smaller current than the 100 W bulb. d. The 60 W bulb has a smaller resistance and greater current than the 100 W bulb. e. We need to know the resistivities of the filaments to answer this question. 3) Three coplanar parallel straight wires carry equal currents I to the right as shown below. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire a. is up out of the plane of the wires. b. is down into the plane of the wires. c. is in the plane of the wires, directed upwards. d. is in the plane of the wires, directed downwards e. cannot be defined, because there is no magnetic force on the middle wire. 4) A parallel plate capacitor of capacitance C0 has plates of area A with separation d between them. When it is connected to a battery of voltage V0, it has charge of magnitude Q0 on its plates. It is then disconnected from the battery and the plates are pulled apart to a separation 2d without discharging them. After the plates are 2d apart, the new capacitance and the potential difference between the plates are a. C0, V0 b. C0, V0 c. C0, 2V0 d. C0, 2V0 e. 2C0, 2V0 5) Equipotentials are lines along which a. the electric field is constant in magnitude and direction. b. the electric charge is constant in magnitude and direction. c. maximum work against electrical forces is required to move a charge at constant speed. d. a charge may be moved at constant speed without work against electrical forces. e. charges move by themselves.6) 7) 8) At a point in space where the magnetic field is measured, the magnetic field produced by a current element a. points radially away in the direction from the current element to the point in space. b. points radially in the direction from the point in space towards the current element. c. points in a direction parallel to the current element. d. points in a direction parallel to but opposite in direction to the current element. e. points in a direction that is perpendicular to the current element and perpendicular to the radial direction. 9) A collection of identical capacitors are fully charged to the same final voltage. Each lightbulb acts as an identical resistor, and lights up when there is any current flowing through it. In which of these situations will the lightbulbs remain lit for the longest period of time? A. One capacitor discharged through 2 bulbs which are in parallel B. One capacitor discharged through 2 bulbs which are in series C. Two capacitors, in series, discharged through 2 bulbs in series D. Two capacitors, in series, discharged through 2 bulbs in parallel E. Two capacitors, in parallel, discharged through 2 bulbs in series F. Two capacitors, in parallel, discharged through 2 bulbs in parallel 10)13) State one thing that is wrong with the Bohr model of the hydrogen atom, and state one thing that is correct in the Bohr model. 14) Name one phenomenon that indicates the wave-like nature of light, and one phenomenon that indicates the particle-like nature of light. 15) A 1.56 m long pipe is open at both ends. What is the frequency of the third harmonic for this pipe? 16) Two rays of light, both with a frequency of 6.76x1014 Hz, are initially in phase. One ray passes through a piece of plastic (n = 1.42) with a thickness L, while the other ray passes through an equally thick piece of glass (n = 1.52). When the two rays emerge into the air, they interfere destructively. What is the minimum possible value of the thickness L? 17) A typical household uses 1390 Joules of energy in a second. What is the minimum number of visible light photons required to deliver an equal amount of light energy? Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com18) Martha, while standing still, sings a musical note (C6, f = 1046.5 Hz), while Vlad drives a convertible car either toward or away from Martha. How fast is Vlad driving, and in which direction, if he hears a D6, f = 1174.7 Hz? 19) A ray of light, traveling through the air, encounters the surface of a glass prism with a 74.0˚ angle of incidence. Some of the light passes into the glass. Inside of the glass, the light has a wavelength of 317 nm and a frequency of 6.00x1014 Hz. a) What is the index of refraction of the glass? b) What is the angle of refraction as the light passes into the glass? c) The light in the glass prism later encounters another glass/air surface (that is not parallel to the original surface). What is the largest angle of incidence at this 2nd glass/air surface for which the light is completely reflected back into the glass prism? 20) Laser light with a wavelength of 650 nm is normally incident on a pair of slits that are 3.00 μm apart and 1.00 μm wide, creating an interference pattern on a nearby wall. Draw a qualitative plot of the light intensity incident on the wall, from the center of the pattern to the 2nd order diffraction minimum. Label any visible interference fringes (bright spots). Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com21a) A singly ionized Oxygen atom has 7 electrons. If you add an 8th electron, making a neutral atom, what are the possible values of each of the quantum numbers (n, l, ml, and ms) for this 8th electron assuming the atom is in its ground state? 21b) What is the highest value for the orbital angular momentum associated with any single electron in the neutral Oxygen atom? 22) An electron is in the 3rd excited state of an infinite potential well that stretches from x = 0 to x = +0.240 nm. Describe any and all x-coordinates (or continuous ranges of the x-axis) at which the particle will never be found. 23a) As a 555 Hz sound wave travels by in the +y direction, a