Quiz 11
1) Data was collected for a thin lens by varying the object distance and locating the image. From the graph and the thin lens equation, what is the focal length of the lens (to the correct number of significant figures)? Ans: 14 cm
2) Two spheres are made from the same material, but one is hollow and the other solid. Which sphere expands more? a)The hollow sphere b)The solid sphere c)They expand the same d)Not enough information
3) A grandfather clock depends on the period to keep time. Suppose the clock is calibrated correctly at sea level and then taken to the top of a very high mountain. Does the clock now run… a)Fast b)Slow c)correctly
4) Light passes from a material with index of refraction 1.3 into one with index 1.2. Compared to the incident ray, what happens to the refracted ray? a)It bends towards the normal. b)It bends away from the normal. c)It is undeflected.
5)An electron and a proton both moving at nonrelativistic speeds have the same de Broglie wavelength. Which of the following quantities are also the same for the particles? a)Speed b)Kinetic energy c)Momentum d)frequency
6) The amplitude of a wave is doubled with no other changes made to the wave. As a result of this doubling, which of the following statements is correct? a)The speed of the wave changes. b)The frequency of the wave changes. c)The maximum transverse speed of an element of the medium changes. d)Statements a-c are all true. e)None of statements a-c are true.
7) In the last 3 columns fill in the correct signs (+, -, 0) for Q, W, and U. SituationSystemQW UUUU Rapidly pumping up a bicycle tire Air in the pump 0++ Pan of room temperature water sitting on a hot stove Water in the pan +0+ Air quickly leaking out of a balloon Air originally in the balloon 0--
8) A camera can be modeled as a simple converging lens that focuses an image on the CCD acting as a screen. A camera is initially focused on a distant object. To focus the image of an object close to the camera, must the lens be … a)moved away from the CCD. b)left where it is. c)moved toward the CCD.
9) Consider an electron, a proton, and a helium nucleus, each trapped separately in identical boxes. Which particle has the longest wavelength in the ground state? a)The electron b)The proton c)The helium nucleus d)They all have the same wavelength.
10) Increasing the intensity of a sound by a factor of 100 causes the sound level to increase by what amount? a)100 dB b)20 dB c)10 dB d)2 dB
11) The molar specific heat of a diatomic gas is measured at constant volume and found to be 29.1 J/mol K. What are the types of energy that are contributing to the molar specific heat? a)Translation only b)Translation and rotation only c)Translation and vibration only d)Translation, rotation, and vibration
12) Which of the following causes the fringes in a two slit interference pattern to move farther apart? a)Decreasing the wavelength of the light b)Decreasing the screen distance L c)Decreasing the slit separation d d)Immersing the entire apparatus in water.
13) A hydrogen atom is in its ground state. Incident on the atoms are many photons each having an energy of 10.5 eV. What is the results. a)The atom is excited to a higher allowed state. b)The atom is ionized. c)The photons pass by the atom without interaction.
14) An ideal gas is taken from an initial temperature T i to a higher final temperature T f along two different reversible paths. Path A is at constant pressure and path B is at constant volume. What is the relation between the entropy changes of the gas for these paths? a) S A > S B b) S A = S B c) S A < S B
15) A polarizer for microwaves can be made as a grid of parallel wires approximately 1 cm apart. The electric field vector for microwaves transmitted through this polarizer is a)parallel to the metal wires. b)perpendicular to the metal wires.