Physics 30examkey

8/13/2019 Physics 30examkey

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Copyright Resource Development Services, Edmonton Public Schools 2009 2

Select the best answer and mark it carefully on your scantron sheet for the multiple choice and on thesupplied answer sheet for numerical response. (1 mark each)

1. Identify the list below that contains only vectors.A. speed, force, acceleration, electric field

B. force, momentum, electric field, distanceC. electric field, force, momentum, displacementD. force, velocity, distance, time

Use the following information to answer the next question.

Four free-body diagrams for a charged oil drop that is between parallel plates are drawn below. Match theappropriate free-body diagram with the description of motion in the questions that follow.

2. A negatively charged oil drop is initially at rest within a uniform electric field. Identify the free-body

diagram(s) that best describes its motion as it begins to travel downwards at a rate of 5.0 m/s2.A. 1B. 2C. 2 & 4D. 4

Fg Fg Fg Fg

FeFe

Fe1 2 3 4


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3. A 250 g ball is travelling at 12.0 m/s to the south when it is hit by a bat and moves at 14.0 m/s tothe north. The balls impulse is:

A. 0.50 kgm/s, north.B. 0.50 kgm/s, south.C. 6.5 kgm/s, north.

D. 6.5 kgm/s, south.

4. Identify the true statement regarding quantities conserved during a collision.A. Kinetic energy and momentum are both conserved in inelastic collisions.B. Only kinetic energy is conserved in elastic collisions.C. Kinetic energy and momentum are both conserved in elastic collisions.D. Only momentum is conserved in elastic collisions.

5. Determine the spacing of the rulings on an interference grating if the third order maximum isobserved to deviate 24 from the central maxima using monochromatic light of 528 nm.A. 1.75 !106mB. 5.83 !107mC. 1.30 !106mD. 3.89 !106m

6. Bungee jumpers jump off high platforms and are tied to ropes that have the ability to stretchsignificantly in order to decrease the jumpers maximum:A. speed by increasing the time to slow down.B. impulse by increasing the time to slow down.

C. momentum by increasing the time to slow down.D. force by increasing the time to slow down.


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Two point charges are arranged as shown in thediagram. Charge A is 5.00 C and charge B is+7.00 C.

The magnitude of the net electric field at point P expressed in scientific notation is

a.bc !10dN/C. The values of a, b, c, and d are _____, _____, ______, ______.

(Record all four digits of your answer in the numerical response section on the answer sheet.)

1.

Numerical Response

P

A

B

6.00 cm

6.00 cm


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A toy contains three different springs that cause the toy to come apart into three identical pieces that allmove along the floor as shown in the diagram below.

7. The direction travelled by the third piece of the toy is:A. 74 S of E.B. 87 W of N.C. 13 N of W.D. 74 N of E.

See scale diagram at endof exam

1.0 m/s

2.0 m/s

N

45


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8. A positively charged object is brought near the right side of a neutral metal sphere. Identify thediagram that best describes the electrical state of the sphere.

Use the following information to answer the next two questions.

Three identical objects, A, B, and C, are brought into contact with each other at the same time. Beforecontact, their charges are +6.00 C, 4.00 C, and +7.00 C. After contact, objects A and B areremoved and the object C touches a neutral sphere, D. Objects C and D are now separated by a distanceof 40 cm.

9. Identify the sign of the charges on sphere C and D.

C D

A. positive negative

B. positive positive

C. negative positiveD. negative negative

When separated by a distance of 40 cm, the magnitude of the force between object C and D,

expressed in scientific notation is b !10wN. The value of b is ____.

(Record your two-digitanswer in the numerical-response section on the answer sheet.)

++

A. B.

C. D.

++

++

2.


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3.

Numerical Response

Use the information below to answers the next question.

The picture below shows a section of the components of a computer hard drive. The read-write head(not shown) is attached to the end of the swing arm that moves when a current passes through thewires that are close to a strong magnetic field.

10. Calculate the force exerted on a section of wire 1.2 cm long carrying a 0.32 A current perpendicularto a magnetic field of 0.42 T.A. 0.16 NB. 0.016 NC. 0.91 ND. 0.0091 N

Alison throws a 0.30 kg ball due east at 4.0 m/s. It collides head on with a 0.35 kg ball thrown byAnna at 5.0 m/s, due west. After the collision the 0.30 kg ball is travelling 1.9 m/s, due west. The

speed of the 0.35 kg ball after the collision in scientific notation is b !10wm/s. The value of bis ____.


magnet

copper wire

swing arm


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4.

Numerical Response

Use the information below to answer the next two questions.

An electron is accelerated from rest across a potential difference between two parallel plates separated by8.0 cm as shown in the diagram below.

11. Select the energies possessed by the electron at the 2.0 cm mark.

The current produced when an electron travels from one plate to the other, expressed in scientific

notation is b !10wA. The value of b is ____.


c .)

V() . ( ) ) 1 1 ( r ) - C ( . ) . ())


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5.

Numerical Response

A1.8!109kgchargedoildropacceleratesupwardsinaverticalelectricfieldof600N/C.When

itsaccelerationisupwardsat3.0m/s2, thechargeontheoildropexpressed in scientific notation is

b !10wC. The value of b is _____.



Positrons, all with the same constant velocity, are introduced into the magnetic field of a massspectrometer. The strength of the magnetic field is varied and the resulting radii of the positrons pathsare measured.

12. To analyze the results, a straight line is obtained by plotting radii on the y-axis. Identify what mustbe plotted on the x-axis. Also identify the meaning of the slope of the straight line.

x-axis slope

A.

B.


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Two charged objects, A and B, exert a force of 3.51 !106N on each other. If the distancebetween A and B is doubled, and charge A is doubled, the force between the two chargesexpressed in scientific notation, is a.bc !10dN. The values of a, b, c, and d are _____, _____,

______, ______.



An alpha particle approaches an electric field and a magnetic field as shown in the two diagrams below.

13. Identify the direction the force on the alpha particle while it is in each field.

Electric Field Magnetic Field

A. down out of page

B. up up

C. up out of page

D. down into page

Magnetic field

!+

Electric field

!+

6.

Numerical Response


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Use the information below to answers the next question.

The Large Hadron Collider (LHC) at CERN Switzerland is a high-energy particle accelerator built 100 munderground. It has a circumference of 27 km. It was constructed at a cost of 10 billion dollars andaccelerates protons near the speed of light before colliding them together. By doing this, physicists can

better understand the internal structure of protons and neutrons. Just as a better understanding of therole of electrons in atomic structure leads to advances in modern technology, it is hoped that a furtherunderstanding of the structure of matter will lead to continued advances.

14. High-energy particle accelerators are required to probe the internal structure of a proton because ofthe:A. protons small size.B. electrostatic repulsive forces between two colliding protons.C. strength of the strong nuclear force.D. difficulty in isolating a proton from a nucleus.

15. A proton is travelling due east when it enters a magnetic field that is towards the south. Identify thedirection of the magnetic force acting on the proton.A. upwardsB. downwardsC. northD. west

16. Identify the situation below that would produce electromagnetic radiation.A. a neutron accelerating from rest

B.

an electron travelling at a constant speedC. a proton travelling in a circleD. a stationary electron

An eight-sided mirror is used to measure the speed of light. The first image (minimum frequency)occurred when the mirror was rotating at 810 Hz. The separation distance between the rotating

mirror and the fixed mirror expressed in scientific notation is b !10wm. The value of b is ____.

(Record your three-digitanswer in the numerical-response section on the answer sheet.)

7.

Numerical Response


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17. Select the list that contains sections of the EMR spectrum ordered from lowest to highest energy.A. infra-red, violet, orange, X-raysB. radio, yellow, blue, gammaC. radio, ultraviolet, blue, infra-redD. infra-red, green, red, gamma

18. The focal length of a lens is dependent on the:A. radius of curvature of the lens.B. refractive index of the material the lens is made from.C. shape of the lens and its refractive index.D. location of the object used.


19. The systems that would produce a virtual image are:A. i and ii.B. i and iv.C. ii and iv.

D. iii and iv.

F F

iii.

ii.

FC

F F

iv.

i.

FC


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20. The kinetic energy of photoelectrons is graphed as a function of frequency of incident light. Selectthe properly matched quantities.

y-intercept x-intercept slope

A. Plancks constant work function threshold frequency

B. work function Plancks constant threshold frequency

C. threshold frequency work function Plancks constant

D. work function threshold frequency Plancks constant

Light having a wavelength of 420 nm is incident on a metal surface having a work function of 2.3 eV.The kinetic energy of the photoelectrons, expressed in scientific notation is _____ eV.


The momentum of a photon having a wavelength of 4.25 !1010m, expressed in scientific

notation is b !10wkgm/s. The value of b is ____.

(Record your three-digitanswer in the numerical-response section on the answer sheet.)

8.

Numerical Response

9.

Numerical Response


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X-rays strike a metal plate causing theejection of electrons as shown in thediagram.

21. The wavelength of the scattered X-rays is:A. 2.29 !1013m.B. 3.54 !1011m.C. 3.50 !1011m.

D. 2.54 !1011m.

22. A major problem with Rutherfords nuclear model of the atom is that:A. a nucleus cannot exist in close proximity to electrons due to the strong nuclear force.B. electrons must be treated as waves not as particles.C. Thomson had proven that atoms are solid and therefore cannot contain a nucleus.D. accelerating charges should produce EMR therefore creating an unstable atom.

23. Determine the deBroglie wavelength of an electron at its maximum speed after it has been

accelerated from rest across a potential difference of 1600 V. A. 1.29 !1018mB. 1.29 !1011mC. 3.07 !1018mD. 3.07 !1011m

scattered X-rays

e

25.1

metal

3.52 x 10

11

mX-rays


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Use the information below to answer the next question.

Electron capture is a decay mode for some unstable nuclei. It occurs when there isnt enough energy toemit a positron. In this type of radioactive decay, a proton in the nucleus attracts an orbiting electron.

The electron collides with the proton in the nucleus thereby transmuting into a neutron and producing aneutrino.

Fe + e! -------> Co +

24. The conservation law that can not be seen to be followed in the above reaction is the law ofconservation of:A. charge.B. nucleons.

C. energy.D. momentum.

25. Identify the radiation that is most dangerous to living tissue.A. ultravioletB. betaC. alphaD. gamma

26. A nucleus of uranium-235 is hit with a low-energy neutron to produce barium-141 and krypton-92.This process may be called:A. radioactive decay.B. fusion.C. fission.D. neutronic decay.


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Use the following information to answer the next three questions.

Mercury gas is used in compact fluorescent lights(CFL). The mercury gas is placed in a sealed tubesand a high voltage between an anode and cathode

causes the release of electrons. An electronreleased from the cathode may collide withanother electron that is in the ground state of amercury atom, thereby causing the production ofa photon. Mercury gas is poisonous, so care mustbe taken not to break the lights.

Some of the possible transitions for an electron in a mercuryatom are given in the energy level diagram shown on the right.


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27. Identify the type of spectra produced when the electrons collide with atoms of mercury to producephotons.A. continuous spectraB. line-emission spectraC. line-absorption spectraD. blackbody radiation


Aaron conducts an experiment to determine the speedof light in a liquid by using the principles of refraction.

Using a red pen laser he manipulates the angle ofincidence and records the angle of refraction.

28. The speed of light in the liquid may be determined using:A.

B.

C.

D.

Sine

ofrefracted

angle

Sine of incident angle

Sine of refracted angle as afunction of sine of incident angle

1 air

2 liquid

"

"

v1= 3.00 x 108m/s

v2= ?


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Use the following information to answer the next 7 questions.

Alberta is part of the Pacific Northwest electrical energy grid that includes BC, Washington state,California and Mexico. A 500 kV line (along with a few smaller ones) goes through Crowsnest Pass,allowing electrical power to be shared between Alberta and BC. Electric power produced at a generating

station cannot typically be stored; if Alberta is producing too much power we sell it to another area onthe grid that had a shortage. When Alberta is experiencing a power shortage other areas on the grid sellus power. However, a problem on one part of the grid may cause problems on the other parts. When apower surge is detected, the generating stations must shut down before they are damaged or destroyed bythe electrical surge.

Problems can occur when either too much power or too littlepower is experienced in a part of the grid. Defectiveequipment, solar flares, and other factors may all contribute tothe problems. The cosmic rays generated by solar flares consist

of many different-charged subatomic particles travelling closeto the speed of light.

Solar activity, such as the generation of sunspots and solarflares, can have important implications to power grids. A solarstorm on March 13, 1989 caused a transformer to overloadand burn out. This plunged the province of Quebec into ablackout for nine hours and damaged other electricalequipment throughout North America.

The Sulphur Mountain Cosmic ray station was built in 1956 tostudy cosmic rays generated by solar flares. It was shut downin 1978.


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Use the following additional information to answer the next question.

Carbon dating is used to determine the age of plants and animals that used to be alive and is reliant onknowing the level of carbon-14 in the atmosphere at the time the organism was alive. This is dependenton the activity of the Sun. Cosmic rays are responsible for the production of carbon-14 in theatmosphere through the reaction below. This carbon-14 eventually enters living systems.

n + N--------> C + p

29. The carbon-14 produced eventually decays into nitrogen-14, _____ and ______.A.

+

B.+

C. +

D. +

A 1.0 g sample of a living tree is analyzed for carbon-14 and found to emit 30.8counts/minute on a Geiger counter. A 1.0 g sample from an artifact found at an ancientcampsite is analyzed and found to emit 7.7 counts/minute. The half-life of carbon-14 is 5730

years. According to the radiocarbon data, the age of the artifact should be b !10wyears. Thevalue of b is _____.


12.

Numerical Response


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Use the following additional information to answer the next four questions.

Protons that form part of the cosmic rays may collide with an electron from a nitrogen molecule in theatmosphere, producing a neutron and various secondary rays as shown in the diagram below. Pions (")can be neutral, positive or negative; they have a short life; and some may change into two gammaphotons that change into an electron and a positron in a process called pair production.

30. The charges on the pions are i _____, ii _______, and iii ____.

i ii iii

A. positive neutral negative

B. neutral positive negative

C. negative neutral positive

D. positive negative positive

31. Some of the pions decay into gamma ray photons which then change into an electron and apositron as shown in the diagram. From this information it can be determined that theminimum possible mass of a pion (") is:

A. 1.022 MeV/c2.B. 2.044 MeV/c2.C. 9.11 !1031kg.D. 1.67 !1027kg.

e e+

iii

#

##

n

e e+

$

proton

Proton collides with an

electron in a nitrogenmolecule

anti

neutrino

i

ii

Gamma photons


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32. The wavelength of each gamma photon created through the decay of a pion isA. 1.22 !1012m.B. 2.43 !1012m.C. 4.43 !1012m.D. 3.43 !1012m.

33. Free neutrons have a short half-life. A neutron that is part of the cosmic rays decays to produce a

beta-negative particle,A. udd quarks and a neutrino.B. uud quarks and an electron.C. udd quarks and an antineutrino.D. uud quarks and an antineutrino.


A photograph was taken showing the tracks of three subatomic particles from cosmic rays in abubble chamber. The tracks are produced from a proton and an electron and positron asa result of pair production.

34. The direction of the magnetic field in the bubble chamber is:A. into the page.B. out of the page.C. to the top of the page.D. to the bottom of the page.

Particlesenter fromhere.

Fm

v


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Two coils and two batteries are used to construct twoelectromagnets as shown in the diagram.

35. The arrow that best represents the direction of the magnetic field at point P is:


A conducting wire is forced to move into the pagethrough a magnetic field, as shown in the diagram.

36. The direction of the induced electron flow through the wire is:A. up.B. down.C. left.D. right.

magnetic field

e-P

A. B.

C. D.


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Use the following information to answer the next two questions.

A beam of hydrocarbon ions are accelerated across a potential difference of 1080 V and then passedperpendicularly through a magnetic field of 0.251 T. This results in a radius of curvature of 12.5 cm.

Use the following additional information to answer the next question.

Six out of the ten Physics principles from your data sheet are listed below.

1. Uniform motion (balanced forces)2. Circular motion (unbalanced forces)3. Work-energy theorem4. Conservation of momentum5. Conservation of energy6. Conservation of charge

The two physics principles required to solve this problem (in the order used) are ______ and_______.

(Record the two digits of your answer in the numerical response section on the answer sheet.)

The ions charge-to-mass ratio expressed in scientific notation should be a.bc !10dC/kg.The values of a, b, c, and d are _____, _____, ______, ______.


14.

Numerical Response

13.

Numerical Response


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MC 7 Drawing a scale diagram is a faster method to obtain an answer.


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Exam Stats

Question Answer % Correct Question Answer % Correct

1 C 19 C

2 B 20 D

3 D 21 B

4 C 22 D

5 D 23 D

6 D 24 D

7 D 25 D

8 D 26 C

9 B 27 B

10 B 28 B

11 A 29 A

12 D 30 A

13 C 31 B

14 C 32 A

15 B 33 D

16 C 34 A

17 B 35 B

18 B 36 A


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Numerical Response

Question Answer % Correct

1 2157

2 1.3

3 5.7

4 1.2

5 3.8

6 1766

7 2.31

8 6.6

9 1.56

10 46

11 5.6 or 5.7

12 1.1

13 2 5

14 2196


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Exam Analysis Multiple Choice

Question Knowledge Skills STS

1 A1.K, B2.1,

B2.2

2 B2.10k B1.3s, B2.3s

3 A1.2k

4 A1.3k, A1.5k

5 C1.10k

6 A1.2k A1.1sts

7 A1.4k

8 B1.3k

9 B1.1k

10 B3.8k

11 B2.8k, B2.9k

12 B1.6k B1.3s

13 B3.2k, B3.5k

14 D4.2k D4.3sts15 B3.5k, B3.7k

16 C1.1k

17 C1.2k

18 C1.7k, C1.11k

19 C1.7k C1.3s

20 C2.3k

21 C2.6k

22 D1.4k, D2.1k

23 D2.6k

24 D3.4k

25 C2.2k, D3.1k26 D3.5k

27 D2.3k

28 C1.6k, C1.11k

29 D3.2k

30 D3.4k

31 D3.6k

32 D3.6k

33 D4.3k

34 D4.1k

35 B336 B3.9k B3.1sts


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Exam Analysis Numerical Response

Question Knowledge Skills STS

1B2.6k

2 B1.6k

3A1.4k

4B2.7k

5B2.10k

6B1.6k

7C1.5k

8 C2.4k

9C2.6k

10D2.4k

11D2.5k,C2.1k

12D3.3k

13B2.9k

14B3.6k

D1.3s D1.1sts,


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Exam Analysis By Unit

UNIT A UNIT B UNIT C UNIT D

A1.K

A1.2KA1.3K, A1.5K

A1.4K

A1.4KA1.5K

B1.1K

B1.1KB1.3K

B1.6K

B1.6KB2.6K

B2.9k, B2.8k

B2.10k

B2.10kB3.1k

B3.2k, B3.5k

B3.6k

B3.7kB3.9k

B3

C1.10K

C1.1KC1.2K

C1.3s

C1.4KC1.5k

C1.6k

C1.7K

C1.7KC1.11k

C2.2K,

C2.3K

C2.6KC2.4K

C2.6K

D1.4k

D2.1kD2.3k

D2.4k

D2.5kD2.6k

D3.1k

D3.3k

D3.5kD4.1k

D4.2k

D4.3k

Exam Analysis Marks Comparison

Date Exam Average Class DiplomaAverage

Provincial DiplomaAverage

January 2010

June 2010

January 2011

June 2011

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