Physics 114, Section A01
Monday Nov. 25, 2019
Dr. A. Meldrum
CCIS L1-160 10:00 – 10:45
Fall 2019 -- Midterm 2
PLEASE DO NOT OPEN YOUR EXAM UNTIL YOU ARE TOLD TO DO SO.
You may begin filling out your Scantron form.
ON THE SCANTRON ANSWER SHEET, PLEASE ENTER THE FOLLOWING:
YOUR NAME [Surname first, then a space, followed by your given name]
STUDENT ID NUMBER [seven digits]
You MUST fill in the bubbles with the above info or your exam will not be marked.
Exam is Multiple Choice. One mark each. Please read ALL answers and select the ONE BEST
OR CLOSEST answer. Bubble in your answers in pencil on the Scantron Answer Sheet. Answers
written on this handout will NOT be marked.
Materials allowed: pens, pencils, rulers, calculator with a faculty of Science or Faculty of
Engineering Approved Sticker. YOUR CALCULATOR MUST BE AN APPROVED MODEL
OR DO NOT TAKE IT OUT.
There are 17 questions. Make sure you try all of them.
IMPORTANT: ON YOUR ANSWER SHEET, UNDER SPECIAL CODES
ENTER J = 7, K = 7
TAKE A DEEP BREATH!
RELAX!
Good luck!
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In-class exams: when the exam is called over, stop writing immediately. Stay quiet and
seated. Your instructor will organize the hand-ins. You must have your Onecard when
you hand your exam in.
Final exam: When the exam is called over, stop writing immediately. Bring your exam to
the TAs for your class. Make sure you hand in your exam at the right place. Bring your
Onecard with your exam.
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1. According to Mendeleyev’s theory, which of these elements would be predicted to have properties
the most similar to those of potassium (Z = 19)?
A.
B.
C.
D.
E.
Calcium (Z = 20)
Argon (Z = 18)
Scandium (Z = 21)
Strontium (Z = 38)
Sodium (Z = 11)
2. The fraction of radioactive material remaining after 10 half-lives of an element have passed is closest
to:
A.
B.
C.
D.
E.
0.05
0.01
0
0.001
We must know the half-life to answer this.
3. Given the same speed, which of these particle’s trajectory will “bend” the most under an applied
electric field in a cloud chamber?
A.
B.
C.
D.
E.
muon
tau
proton
neutrino
positron
4. What key discovery of Marie Curie’s led her to ultimately discover two new elements?
A.
B.
C.
D.
E.
Uranium ore was more radioactive than pure uranium.
The fluorescence (light emission) of uranium ore was stronger than expected.
The blue glow of radium solutions.
The strange shapes developed on photographic plates.
Uranium ore was denser than theoretically possible.
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5. Which of the following types of particles will self-annihilate the fastest by matter-antimatter
recombination?
A. The + ( ud )
B. The - ( du )
C. neutron ( udd )
D. The 0 ( uu )
E. The proton uud
6. Which of the following baryons can exist?
A. uu
B. uud
C. sss
D. ss
E.
uud
7. Michelson’s rotating 8-sided mirror experiment for measuring the speed of light would result in light
being detected in the detector if, in the time it took like to bounce off the distant mirror and return:
A.
B.
C.
D.
E.
The rotating mirror went around an angle of 45 degrees.
The rotating mirror went around an angle of 90 degrees.
The rotating mirror went around an angle of 135 degrees.
The rotating mirror went around an angle of 180 degrees.
All of the above.
8. When a proton decays into a neutron, what must happen to its quark composition?
A.
B.
C.
D.
E.
It remains unchanged.
One down quark turns into an up quark.
An up quark turns into a down quark.
One up quark turns into an anti-up quark.
Two up quarks turn into two down quarks.
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9. Which of the following particles could possibly be the same as its antiparticle, based on all the
properties we have learned so far?
A.
B.
C.
D.
E.
neutrino
neutron
anti-neutron
Neutral charmed lambda baryon
All of the above
10. A person shouting produces a sound wave that has a pressure amplitude we will represent as A. If she
instead shouts more loudly in order to produce a pressure wave of amplitude 2A, how does the speed
of the “louder” wave (amplitude 2A) compare with the quieter one (amplitude A)?
A.
B.
C.
D.
E.
The speed of both waves is the same
The speed of the louder wave is twice that of the quieter one.
The speed of the quieter wave is twice that of the louder one.
The speed of the louder wave is four times that of the quieter one.
The speed of the quieter wave is four that of the louder one.
11. The following photograph is taken from an airplane looking down on the ocean water. What property
of waves is illustrated?
A. Wave energy
B. Frequency
C. Elastic collision
D. Wave speed
E. Diffraction
12. Which of the following charges are not possible for hadrons? YOU
MUST SELECT THE TWO CORRECT ANSWERS.
A. +1
B. +2
C. +3
D. –2
E. +2/3
13. The speed of sound is 343 m/s in air. What is this speed relative to?
A.
B.
C.
D.
E.
The observer
The emitter
The air
undefined
the difference in speeds between the observer and emitter
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14. Let’s say there was an element that had two stable isotopes, one having mass 100 and the other 101.
The lighter isotope has 75% abundance. All other possible isotopes are short lived. What would be
the atomic weight of this hypothetical element in the periodic table?
A.
B.
C.
D.
E.
100
100.67
100.33
100.75
100.25
15. A water wave has a period of 0.5 seconds and a wavelength of 1.5 meters. What is its speed?
A.
B.
C.
D.
E.
0.33 m/s
0.75 m/s
2 m/s
3 m/s
Not enough information to solve
16. Anti-hydrogen consists of:
A.
B.
C.
D.
E.
A positron and an electron
A positron and an antiproton
A proton and an electron
An antiproton and an electron
None of the above
17. Which of the following decay products that are theoretically possible for the negative pion (quark
composition: du )?
i.
e − + e
ii.
 − + 
iii.
iv.
Antiproton: uud
Proton: uud
A.
B.
C.
D.
E.
i and ii
i only
ii only
iii and iv
iii only
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