General Physics II Summer Session 2013 Review Ch - 16, 17, 18

Transcription

1 General Physics II Summer Session 2013 Review Ch - 16, 17, 18 A metal ball hangs from the ceiling by an insulating thread. The ball is attracted to a positivecharged rod held near the ball. The charge of the ball must be: 1) positive 2) negative 3) neutral 4) positive or neutral 5) negative or neutral The force between two charges separated by a distance d is F. If the charges are pulled apart to a distance 3d, what is the force on each charge? 1) 9 F 2) 3 F 3) F 4) 1/3 F 5) 1/9 F You are sitting a certain distance from a point charge, and you measure an electric field of E 0. If the charge is doubled and your distance from the charge is also doubled, what is the electric field strength now? (1) 4 E 0 (2) 2 E 0 (3) E 0 (4) 1/2 E 0 (5) 1/4 E 0 What are the signs of the charges whose electric fields are shown at right? Which of the charges has the greater magnitude?

2 Two point charges, Q 1 =2.0 and Q 2 =4.0 μc are separated by 1.5 cm. Find the force on charge Q 1 due to Q 2. What are the magnitude and direction of the electric field at a distance of 1.50 m from a 50.0-nC charge? It takes 50 J of energy to move 10 C of charge from point A to point B. What is the potential difference between points A and B? Starting from rest, a proton acquires a kinetic energy of 1.2 kev. What is its speed? A parallel-plate capacitor has plates of area 0.20 m2 separated by a distance of 1.0 mm and is connected to a 6.0-V battery. How much charge can be stored? What is the strength of the electric field between these plates? A 12-V battery is connected to a 100-Ω resistor. How many electrons flow through the wire in 1.0 min?

3 General Physics II Summer Session 2013 Review Ch 18, 19, 20 A circuit maintains a constant resistance. If the current in the circuit is doubled, what is the effect on the power dissipated by the circuit? The power dissipated is doubled. The power dissipated remains constant. The power dissipated is reduced by a factor of 2. The power dissipated is reduced by a factor of 4. The power dissipated is quadrupled. A current that is sinusoidal with respect to time is referred to as A) a direct current. B) an alternating current. When you rotate the knob of a light dimmer, what is being changed in the electric circuit? 1) the power 2) the current 3) the voltage 4) both (1) and (2) 5) both (2) and (3) Consider two copper wires of same resistance. One has twice the length and twice the crosssectional area of the other. How do the resistivity of these two wires compare? A) Both wires have the same resistivity B) The longer wire has twice the resistivity of the shorter wire. C) The longer wire has four times the resistivity of the shorter wire. D) none of the given answers The light bulbs in the circuit below are identical with the same resistance R. Which circuit produces more light? (brightness power) Determine the direction of the force on the charge due to magnetic field

4 A charged particle enters into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field vector. Ignoring the particle's weight, what type of path will the particle follow? The charged particle will follow a straight-line path. The charged particle will follow a circular path. The charged particle will follow a spiral path. The charged particle will follow a parabolic path A 12-V battery is connected to a 100-Ω resistor. How many electrons flow through the wire in 1.0 min? A toaster is rated 800 W at 120 V. What is the resistance of its heating element? How much current flows through it? A 500-W device is connected to a 120-V ac power source. What peak current flows through this device? A series combination of a 3.0-Ω and a 4.0-Ω resistor is connected to a 98V-circuit. What is the voltage drop across the 4.0-Ω resistor? Two capacitors: 8 μf and 16 μf. What is the equivalent capacitance if they are connected in: (a) parallel? (b) series? A 2.0-m wire carrying a current of 0.60 A is oriented parallel to a uniform magnetic field of 0.50 T. What is the magnitude of the force it experiences? A proton with a kinetic energy of 10-Mev moves in a circular path of radius 0.20 m when it is in a uniform magnetic field. What is the magnitude of the magnetic field?

5 General Physics II Summer Session Review Ch 23 The range of visible spectrum is: What is a light year? Plane mirror forms an image that is virtual or real? Upright or inverted? Light travels faster in water than in vacuum True or False Consider a ray of light that propagates from water (n=1.33) to air (n=1). If the incident ray strikes the water-air interface at an angle θ 1, which of the following regarding the angle of refraction, θ 2 is correct? The principle on which fiber optics is based is: Rays from Sun (or distant object) focus at a point 20.0 cm behind a lens. Is this a converging or diverging lens? Its power is A lens produces a real image of a real object. Is the image inverted or upright? Is the lens diverging or converging? You wish to create an image that is to be inverted using a spherical mirror. Is this a concave or convex mirror? Is the image real or virtual? An object is 12 cm in front of a converging lens with focal length 20 cm. Where is the image? What is its magnification? Draw a ray diagram. An object is placed at 50 cm in front of a converging lens with a focal length of 10 cm. Where is the image formed? What is the magnification? Draw a ray diagram. An object is placed 50 cm from a concave mirror of focal length 20 cm. The object is 4.0 cm tall. Find the image distance and its size. Is this a real or virtual image? Draw a ray diagram for this case. CONTINUED IN THE BACK.

6 Review Ch A 2.0-cm high object is placed 10.0 cm from a concave mirror whose radius of curvature is 40.0 cm. (a) Determine the position of the image (b) its height and magnification (c) Draw a ray diagram (d) Is this a real or virtual image? 2. A 2.5-cm object is placed 15.0 cm from a spherical mirror which produces an image which is three times the size of the object. Determine (a) the focal length of this mirror (b) What kind of mirror is this? (c) Is the image real or virtual? (d) Draw a ray diagram. 3. An external rearview car mirror is a convex mirror with a radius of curvature of 20-m. Determine the location of the image and its magnification for an object 25.0m from the mirror. Draw a ray diagram. 4. You are standing 2.0 m from a convex security mirror in a store. You estimate the height of your image to be one-third of your actual height. What is the focal length of the mirror.

7 General Physics II Summer Session Review Ch 24 The principle which allows formation of rainbow is: Interference Dispersion Diffraction Consider two diffraction gratings. One grating has 3000 lines per cm, other one has 6000 lines per cm. Both gratings are illuminated with a beam of the same monochromatic light. Which grating produces the greater dispersion? A) The grating with 3000 lines produces the greater dispersion B) The grating with 6000 lines produces the greater dispersion C) The dispersion cannot be determined without additional information D) Both gratings produce the same dispersion. The separation between adjacent maxima in a double-slit interference pattern using monochromatic light is A) greatest for red light. B) greatest for green light. C) greatest for blue light. D) the same for all colors of light. In a single slit diffraction experiment, if the width of the slit increases, what happens to the width of the central maximum on a screen? A) It increases. B) It decreases. C) It remains the same. D) There is not enough information to determine. 1. Light of wavelength 550 nm in air is found to travel at m/s in a certain liquid. Determine the wavelength of the light in the liquid. 2. Two thin slits are mm apart. Monochromatic light of wavelength 634 nm falls on the slits. If there is a screen 6.0 m away, how far apart are adjacent interference fringes? 3. A single slit, which is mm wide, is illuminated by light of 550 nm wavelength. What is the angular separation between the first two minima on either side of the central maximum? 4. Light of wavelength 580 nm is incident on a slit of width mm. An observing screen is placed at a distance of 2.00 m from the slit. Find the width of the central maximum. 5. Light of wavelength 367-nm illuminates a diffraction grating. The 4 th order maxima is observed at an angle of Calculate the number of lines per cm in the grating.

8 General Physics II Summer Session Review Ch A star has peak intensity at 580 nm. What is its temperature? 2. How much energy is carried out by a photon of wavelength 633 nm? Give your answer in both Joules and ev. 3. The energy of the hydrogen atom (Z = 1) in its ground state is ev. What is its energy when it is in the n = 5 state? What is the required ionization energy for this state? 4. A metal has a work function of 4.5 ev. Find the maximum kinetic energy and speed of an electron when illuminated by a light of wavelength (a) 250 nm (b) 750 nm. 5. Determine the wavelength for the following: (a) Third Paschen line (b) Fourth Balmer line (c) First Lyman line