Quiz 11 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 2) Two spheres are made from the same material, but one is hollow and the other material, but one is hollow and the other solid. Which sphere expands more?solid. Which sphere expands more?

a)a) The hollow sphereThe hollow sphere

b)b) The solid sphereThe solid sphere

c)c) They expand the sameThey expand the same

d)d) Not enough informationNot enough information

3) A grandfather clock depends on the 3) A grandfather clock depends on the period to keep time. Suppose the clock is period to keep time. Suppose the clock is calibrated correctly at sea level and then calibrated correctly at sea level and then taken to the top of a very high mountain. taken to the top of a very high mountain. Does the clock now run…Does the clock now run…

a)a) FastFast

b)b) SlowSlow

c)c) correctlycorrectly

4) Light passes from a material with index 4) Light passes from a material with index of refraction 1.3 into one with index 1.2. of refraction 1.3 into one with index 1.2. Compared to the incident ray, what Compared to the incident ray, what happens to the refracted ray?happens to the refracted ray?

a)a) It bends towards the normal.It bends towards the normal.

b)b) It bends away from the normal.It bends away from the normal.

c)c) It is undeflected.It is undeflected.

5)An electron and a proton both moving at 5)An electron and a proton both moving at nonrelativistic speeds have the same de nonrelativistic speeds have the same de Broglie wavelength. Which of the Broglie wavelength. Which of the following quantities are also the same for following quantities are also the same for

the particles?the particles?

a)a) SpeedSpeed

b)b) Kinetic energyKinetic energy

c)c) MomentumMomentum

d)d) frequencyfrequency

6) The amplitude of a wave is doubled with 6) The amplitude of a wave is doubled with no other changes made to the wave. As a no other changes made to the wave. As a result of this doubling, which of the result of this doubling, which of the following statements is correct?following statements is correct?

a)a) The speed of the wave changes.The speed of the wave changes.

b)b) The frequency of the wave changes.The frequency of the wave changes.

c)c) The maximum transverse speed of an The maximum transverse speed of an element of the medium changes.element of the medium changes.

d)d) Statements a-c are all true.Statements a-c are all true.

e)e) None of statements a-c are true.None of statements a-c are true.

7) In the last 3 columns fill in the 7) In the last 3 columns fill in the correct signs (+, -, 0) for Q, W, and correct signs (+, -, 0) for Q, W, and U.U.

SituationSituation SystemSystem QQ WW UU

Rapidly pumping up a Rapidly pumping up a bicycle tirebicycle tire

Air in the pumpAir in the pump 00 ++ ++

Pan of room temperature Pan of room temperature water sitting on a hot stovewater sitting on a hot stove

Water in the panWater in the pan ++ 00 ++

Air quickly leaking out of a Air quickly leaking out of a balloonballoon

Air originally in Air originally in the balloonthe balloon 00 -- --

8) A camera can be modeled as a simple 8) A camera can be modeled as a simple converging lens that focuses an image on converging lens that focuses an image on the CCD acting as a screen. A camera is the CCD acting as a screen. A camera is initially focused on a distant object. To initially focused on a distant object. To focus the image of an object close to the focus the image of an object close to the camera, must the lens be …camera, must the lens be …

a)a) moved away from the CCD.moved away from the CCD.

b)b) left where it is.left where it is.

c)c) moved toward the CCD.moved toward the CCD.

9) Consider an electron, a proton, and a helium 9) Consider an electron, a proton, and a helium nucleus, each trapped separately in identical nucleus, each trapped separately in identical boxes. Which particle has the longest wavelength boxes. Which particle has the longest wavelength in the ground state?in the ground state?

a)a) The electronThe electron

b)b) The protonThe proton

c)c) The helium nucleusThe helium nucleus

d)d) They all have the same wavelength.They all have the same wavelength.

10) Increasing the intensity of a sound by a 10) Increasing the intensity of a sound by a factor of 100 causes the sound level to factor of 100 causes the sound level to increase by what amount?increase by what amount?

a)a) 100 dB100 dB

b)b) 20 dB20 dB

c)c) 10 dB10 dB

d)d) 2 dB2 dB

11) The molar specific heat of a diatomic gas is 11) The molar specific heat of a diatomic gas is measured at constant volume and found to be 29.1 measured at constant volume and found to be 29.1 J/mol K. What are the types of energy that are J/mol K. What are the types of energy that are contributing to the molar specific heat?contributing to the molar specific heat?

a)a) Translation onlyTranslation only

b)b) Translation and rotation onlyTranslation and rotation only

c)c) Translation and vibration onlyTranslation and vibration only

d)d) Translation, rotation, and Translation, rotation, and vibrationvibration

12) Which of the following causes the fringes in a 12) Which of the following causes the fringes in a two slit interference pattern to move farther two slit interference pattern to move farther apart?apart?

a)a) Decreasing the wavelength of the Decreasing the wavelength of the lightlight

b)b) Decreasing the screen distance LDecreasing the screen distance L

c)c) Decreasing the slit separation dDecreasing the slit separation d

d)d) Immersing the entire apparatus in Immersing the entire apparatus in water. water.

13) A hydrogen atom is in its ground state. 13) A hydrogen atom is in its ground state. Incident on the atoms are many photons each Incident on the atoms are many photons each having an energy of 10.5 eV. What is the results.having an energy of 10.5 eV. What is the results.

a)a) The atom is excited to a higher allowed The atom is excited to a higher allowed state.state.

b)b) The atom is ionized.The atom is ionized.

c)c) The photons pass by the atom without The photons pass by the atom without interaction.interaction.

14) An ideal gas is taken from an initial 14) An ideal gas is taken from an initial temperature Ttemperature Tii to a higher final temperature T to a higher final temperature Tff

along two different reversible paths. Path A is at along two different reversible paths. Path A is at constant pressure and path B is at constant constant pressure and path B is at constant volume. What is the relation between the entropy volume. What is the relation between the entropy changes of the gas for these paths?changes of the gas for these paths?

a)a) SSAA > > SSBB

b)b) SSAA = = SSBB

c)c) SSAA < < SSBB

15) A polarizer for microwaves can be made as a 15) A polarizer for microwaves can be made as a grid of parallel wires approximately 1 cm apart. grid of parallel wires approximately 1 cm apart. The electric field vector for microwaves The electric field vector for microwaves transmitted through this polarizer istransmitted through this polarizer is

a)a) parallel to the metal wires.parallel to the metal wires.

b)b) perpendicular to the metal wires.perpendicular to the metal wires.