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PHYS 1260 FINAL EXAM | ALL QUESTIONS AND
CORRECT ANSWERS | GRADED A+ | VERIFIED
ANSWERS | LATEST EXAM 2025 (JUST
RELEASED)
The index of refraction for crown glass, common in eyeglasses, is 1.52. the index of refraction of a particular plastic lens is 1.76. light bends more in the ---------CORRECT ANSWER-----------------plastic lens The image of the "infinitely-far-away" Sun produced by a converging lens appears ---------CORRECT ANSWER-----------------at the focal point A "pinhole camera" has no lens. the tiny pinhole opening ensure that rays of light from different parts of an object ---------CORRECT ANSWER---------- -------don't overlap In a converging lens, objects infinitely far away are focused --------- CORRECT ANSWER-----------------at the focal point When taking a photo of a nearby flower, your camera lens should be set --- ------CORRECT ANSWER-----------------farther than one focal length from the photosensitive surface Which of the following can be projected onto a viewing screen? --------- CORRECT ANSWER-----------------real image
A spectroscope is used to analyze a sample by separating its components into a spectrum. if lens #1 were omitted, the resulting spectrum would be --- ------CORRECT ANSWER-----------------much dimmer Farthest point at which an object can be clearly seen ---------CORRECT ANSWER-----------------far point What type of lens would we need to correct for a person's nearsightedness? ---------CORRECT ANSWER-----------------diverging A magnifying glass has a certain focal length. compared to this magnifier, a second glass with a thicker lens will have a focal length that is --------- CORRECT ANSWER-----------------shorter The ocular in a microscope behaves like a(n) ---------CORRECT ANSWER- ----------------magnifying glass What forms a real image of the object? ---------CORRECT ANSWER---------- -------objective What is used as a magnifier to view the image formed by the objective ------ ---CORRECT ANSWER-----------------eyepiece If the charge is negative, the direction of F is simply ---------CORRECT ANSWER-----------------reversed
When two lamps are connected in series to a battery, the electrical resistance that the battery "senses" is ---------CORRECT ANSWER----------- ------more than the resistance of either lamp When two lamps are connected in parallel to a battery, the electrical resistance that the battery "senses" is ---------CORRECT ANSWER----------- ------less than the resistance of either lamp The force on an electron moving in a magnetic field will be least when its direction is ---------CORRECT ANSWER-----------------the same as the magnetic field direction The amount of current produced by electromagnetic induction depends on the ---------CORRECT ANSWER------------------amount of induced voltage
- resistance of the circuit to which it is connected Electromagnetic induction occurs in a coil when there is change in --------- CORRECT ANSWER-----------------magnetic field intensity in the coil On some early automobiles, both headlights failed when one bulb burned out. the headlights were likely connected in ---------CORRECT ANSWER---- -------------series Magnet A has twice the magnetic field strength of Magnet B and at a certain distance pulls on magnet B with a force of 100 N. The amount of
force that magnet A exerts on magnet B is ---------CORRECT ANSWER----- ------------exactly 100N Compared to the huge force that attracts an ion tack to a strong magnet, the force that the tack exerts on the magnet ---------CORRECT ANSWER--- --------------equally huge Like kinds of magnetic poles repel while unlike kinds of magnetic poles ----- ----CORRECT ANSWER-----------------attract Whereas electric charges can be isolated, magnetic poles --------- CORRECT ANSWER-----------------cannot Surrounding every stationary electron is ---------CORRECT ANSWER-------- ---------an electric field Surrounding every moving electron is ---------CORRECT ANSWER------------ ------a magnetic field
- an electric field The shape of a magnetic field surrounding a current-carrying conductor is -- -------CORRECT ANSWER-----------------circular Can you seperate so much that the force between them is zero? --------- CORRECT ANSWER-----------------no
If 10 J of work is used in pushing a 1-C charge into an electric field, its electric potential relative to its starting position is ---------CORRECT ANSWER-----------------10 V A zero potential does not necessarily mean a null ____ ---------CORRECT ANSWER-----------------electric field An electron is pushed into an electric field where it acquires a 1-V electric potential. If two electrons are pushed the same distance into the same electric field, the electric field of each electron is ---------CORRECT ANSWER-----------------1 V When you turn on a lamp, the initial current in its filament is greater at first, rather than a moment later which indicates ---------CORRECT ANSWER----- ------------increased temperature means increased resistance Ohms law tells us that the amount of current produced in a circuit is ____ and ____ ---------CORRECT ANSWER-----------------directly proportional to voltage, inversely proportional to resistance Electrostatics is a branch of electricity that focuses on ____ and ____ ------- --CORRECT ANSWER-----------------electrical force, charge when static in a electrically neutral atom, the number of protions is equal to the number of ---------CORRECT ANSWER-----------------electrons that surrounds the nucleus
the pair of protons in the nucleus of a helium atom ---------CORRECT ANSWER-----------------attract a pair of orbiting electrons two protions attract each other gravitationally and repell each other electrically. the strongest of these two forces is ---------CORRECT ANSWER-----------------electrical the unit of electric charge, the Coulomb, is the charge on a --------- CORRECT ANSWER-----------------specific large number of electrons fundamental charge ---------CORRECT ANSWER-----------------e = 1.9 x 10^-19 C when the distance between 2 charges is halved, what happens to the electrical force between them? ---------CORRECT ANSWER----------------- quadruples Coulomb's Law ---------CORRECT ANSWER-----------------Fe = k(q1)(q2)/r^ the electric field between oppositely-charged parallel plates is --------- CORRECT ANSWER-----------------uniform to think of electric potential difference, we are thinking about --------- CORRECT ANSWER-----------------voltage
convention ---------CORRECT ANSWER-----------------electric field lines point from + to - electric potential ---------CORRECT ANSWER-----------------energy per unit charge and is measured in volts potential difference ---------CORRECT ANSWER-----------------"voltage drop" "voltage drop" or potential difference ---------CORRECT ANSWER------------- ----∆V = Va - Vb change in position ---------CORRECT ANSWER-----------------change in potential capacitor ---------CORRECT ANSWER-----------------Q = C∆V unit of farads (F) ---------CORRECT ANSWER-----------------1F = 1C/V electric current ---------CORRECT ANSWER-----------------the rate of flow of charge (e-) and is measured in amperes
electric current (more formally) ---------CORRECT ANSWER-----------------I = ∆Q/∆t ohms law ---------CORRECT ANSWER-----------------R = ∆V/I resistivity sign ---------CORRECT ANSWER-----------------ρ resistance ---------CORRECT ANSWER-----------------R = ρ l/A stretch causes increase in length leading to what in area and resistance ---- -----CORRECT ANSWER-----------------decrease in area and increase in resistance resistance based on tempertare ---------CORRECT ANSWER----------------- R(T) = Ro[1 + α (T - To)] Increase in R leads to ____ in T ---------CORRECT ANSWER----------------- increase the frequency of induced voltage in a wire coil depends on --------- CORRECT ANSWER-----------------how frequently a magnet dips in and out of the coil
e-field begin ---------CORRECT ANSWER-----------------at positive charges and end at negative charges b-field lines ALWAYS ---------CORRECT ANSWER-----------------form closed paths a convention that helps us make sense of the phenomenon that electromagnetic induction attempts to undo any change in the magnetic flux ---------CORRECT ANSWER-----------------lenz's law time varying current---time varying b-field---induced emf ---------CORRECT ANSWER-----------------self-induction constant of proportionality ---------CORRECT ANSWER----------------- inductance inductance combined with faraday's law ---------CORRECT ANSWER-------- ---------back emf most of the waves in the electromagnetic spectrum are ---------CORRECT ANSWER-----------------invisible
electromagnetic waves consist of ---------CORRECT ANSWER----------------- oscillating electric and magnetic fields which of the following cannot travel in a vacuum (free spaces)? - -------- CORRECT ANSWER-----------------sound waves the fact that you can see stars in the nighttime sky is evidence that --------- CORRECT ANSWER-----------------our atmosphere is transparent to visible light and light can travel in a vacuum light is reflected when ---------CORRECT ANSWER-----------------incident light is returned into the medium from which it came when sunlight illuminates a page from you book it ---------CORRECT ANSWER-----------------reflects most of it and absorbs at the text lettering light travels from one place to another along a path of least --------- CORRECT ANSWER-----------------time Fermat's principle applies to ---------CORRECT ANSWER----------------- reflection and refraction refraction ---------CORRECT ANSWER-----------------travel time is minimized
the type of lens that spreads parallel light is a ---------CORRECT ANSWER- ----------------diverging lens the type of lens that brings parallel light rays together is a --------- CORRECT ANSWER-----------------converging lens an upright object placed beyond the focal point of a concave lens will produce an image that is ---------CORRECT ANSWER-----------------virtual and upright an upright object placed within the focal point of a concave lens will produce an image that is ---------CORRECT ANSWER-----------------virtual and upright a thicker concave lens will have a focal length that is ---------CORRECT ANSWER-----------------longer a real object placed far away relative to the focal length of a concave lens (s>>f) will produce an image located at the ---------CORRECT ANSWER----- ------------focal point a concave lens has a negative focal length, therefore causing image forming rays to ---------CORRECT ANSWER-----------------diverge
an upright object placed beyond the focal point of a convex lens will produce an image that is ---------CORRECT ANSWER-----------------real and inverted an upright object placed within the focal point of a convex lens will produce an image that is ---------CORRECT ANSWER-----------------virtual and upright a thicker convex lens will have a focal length that is ---------CORRECT ANSWER-----------------shorter a real object placed far away relative to the focal length of a convex lens (s>>f) will produce an image located at the ---------CORRECT ANSWER----- ------------focal point a convex lens has a positive focal length, therefore causing image forming rays to ---------CORRECT ANSWER-----------------converge when a pulse of white light is incident on a glass prism, the first color to emerge is ---------CORRECT ANSWER-----------------red which of the following focal lengths would be appropriate for the ocular of an astronomical telescope: 2.5 cm
- 2.5 cm 5 cm
- 10 cm 40 cm ---------CORRECT ANSWER-----------------2.5 cm and 5 cm
thin lens equation ---------CORRECT ANSWER----------------- (1/s)+(1/s')=(1/f) +m ---------CORRECT ANSWER-----------------upright
- m ---------CORRECT ANSWER-----------------inverted m> 0 ---------CORRECT ANSWER-----------------bigger m<0 ---------CORRECT ANSWER-----------------smaller sharp image ---------CORRECT ANSWER-----------------image-forming rays do not overlap blurry image ---------CORRECT ANSWER-----------------image-forming rays do overlap convex is ---------CORRECT ANSWER-----------------converging concave is ---------CORRECT ANSWER-----------------diverging
intial image by cornea ---------CORRECT ANSWER-----------------refined 2x by the lens the job of glasses or contact is to ---------CORRECT ANSWER----------------- place the image at a person's far point thicker convex ---------CORRECT ANSWER-----------------shorter oval thicker concave ---------CORRECT ANSWER-----------------longer oval bohr model's 4 assumptions ---------CORRECT ANSWER-----------------1. a single electron of negative charge electron orbits the nucleus of positive charge electron
- only certain size orbits are allowed
- whenin one of its allowed orbits, the electron emit no radiation
- when an electron changes from a high-energy orbit to a lower-energy orbit, the excess energy is emitted as a photon The superposition of waves can produce ---------CORRECT ANSWER------- ----------Reinforcement cancellation partial cancellation The superposition identical waves affect ---------CORRECT ANSWER-------- ---------Amplitude x(t)=Asin(...)
