ChemPhys 173 - Semester Review

First Semester, 2013-2014

 

Background Information

The physics exam for ChemPhys 173 will be held held from 12:20-1:50 on Wednesday, January 15. (If there is a snow day or some other unforeseen reason for the cancellation of school, then check the ChemPhys home page for an update on time and location.) The exam will be a 50-minute exam covering all topics learned during the first semester. The exam will be started the moment the period begins and will be collected at the end of the period; extra time will not be alloted. If there are special circumstances that require that you need additional time, then see Mr. Henderson privately before the day of the exam to discuss arrangements; unless such arrangements are made prior to exam day, no extra time will be allotted.

Most questions are multiple-choice; there are a few problem-solving questions. Many of the multiple choice questions include up to 10 possible choices - from a through e and such choices as ab, ac, ad, etc. Planning to guess on questions is unlikely to be a wise alternative to planning to prepare. The MC answers will be placed on GradeMaster forms; the solutions to the problems will of course be worked out on a separate sheet of paper. Each class period will have a separate form of the exam with nearly identical or at least very similar questions. The exam is not likely to be curved; it would not be surprising if there are several perfect scores. Your exam score will comprise 20% of your semester grade in ChemPhys as per school policy.

 

Contents of Exam

There are approximately 79 multiple choice questions and 8 problems on the final exam. The breakdown of multiple choice questions by topic and unit is  as follows:

Unit/Topic

Approx. # of Qs

Unit 1: Reflection and Mirrors

The law of reflection, diffuse reflection, plane mirrors, image formation, ray diagrams for plane mirrors, multiple mirror systems, curved mirrors (concave vs. convex), ray diagrams, object-image relations, mirror equation, magnification ratio

~13 Qs

Unit 2: Refraction and Lenses

Refraction (cause, direction of bending, relationship to v, n and density), Snell's law, determining n value, total internal reflection, critical angle,lenses (convergin vs. diverging), ray diagrams for lenses, object-image relations, lens equation, magnification ratio

~9 Qs

Unit 3: Wave Basics

Wave nature, wave anatomy and teminology, categories of waves, wave equation, wave behaviors (interference, boundary behavior, etc.), standing wave mathematics

~12 Qs

Unit 4: Sound waves and Music

Nature of a sound wave, properties of sound and their relationships (frequency, pitch, wavelength, period, amplitude, loudness, intensity, deciBel scale, speed), Doppler effect, resonance, natural frequency and forced vibration; standing wave patterns, harmonics, fundamental frequency, mathematics for strings and for open-end and closed-end air columns

~13 Qs

Unit 5: Light and Color

Two-point source interference (nodal and anti-nodal lines; path difference and type of interference), Young's experiment; relationship between variables; mathematical computation of wavelength, electromagnetic and visible light spectrum, polarization of light (polarized vs. unpolarized light, use of polaroid filters, polarization axis vs. molecule alignment, polarization by reflection), primary light colors, color addition, secondary light colors, pigments and complementary colors of light, color subtraction, colored filters, shadows.

~11 Qs

Unit 6: Kinematics

Vector vs. scalar, distance vs. displacement, speed vs. velocity, average speed and average velocity versus instantaneous values, acceleration (definition, units, direction, equation, calculations of a), dot diagrams; position-time and velocity-time data, position-time graphs (meaning of shape and slope of plots; determination of velocity; relating the motion to graph features), velocity-time graphs (meaning of shape, slope and area of plots; determination of displacement and acceleration; relating the motion to graph features), kinematic equations and problem solving, free fall scenarios and problem solving

~11 Qs

Unit 7: Vectors and Projectiles

Vector vs. scalar, vector direction, vector addition (Pythagorean theorem, graphical method; component method) resultant, vector resolution, vector components,  trigonometric analysis, relative velocity, riverboat problems (3 basic questions), independence of perpendicular components of motion, projectile concepts (definition; acceleration, velocity, dot diagram, vector diagrams), projectile mathematics (horizontally launched projectiles vs. non-horizontally launched projectiles)
~11 Qs


Regarding the multiple choice questions:

Very few of the questions require the use of a calculator. Most questions can be answered quickly. A few questions involve in-depth analysis. Several questions involve reading a short passage and using information in the passage, in a data table or on a graph to answer the question. Some multiple choice questions are quantitative as opposed to conceptual; very few of these (maybe 6) would require a calculator.Most calculations are straight-forward. Many quantitative questions are accompanied by a diagram - e.g., a resonance pattern or a velocity-time graph - which forms the basis of the computation. Expect the overall majority of multiple choice questions to be purely conceptual or process based (using some reasoning).


Regarding The Short Problem Section

Every question on the exam is worth 1 point. There are 8 short problems at the end of the test. These are also 1-point questions. The problems are not horendous, multi-step problems. There will be very few 4-, 5-, ... or 8-step problems. Repeat: all questions are worth one point. Do not blow 5-10 minutes trying to solve a Refraction/Trigonometry question at the expense of not solving the other 86 other 1-point questions. If such a question is that difficult for you, then count it as a loss and continue on with those questions which you do know; return to the troublesome questions after the rest of the test.


Provided Physics Formulas

The following math equations will be provided on the test:

v = f•lambda
v = d/t
f = 1/T
1/do + 1/di = 1/f
M = hi/ho = - di/do
v = c/n
ni • sin(thetai) = nr • sin (thetar)
dB = 10• log(I/1 x 10-12 W/m2)
c = 3.0 * 108 m/s
lambda = y * d / (m*L) v = d / t a = Delta v / t
d = [(vo + vf) / 2] • t d = vo • t + 0.5 • a • t2 vf = vo + a • t
vf2 = vo 2 + 2 • a • d SOH CAH TOA


How to Prepare

There are numerous ways to prepare for the test. The best ways are those that help you learn the material. This will be different for different learners with different learning styles. The main thing is to devote some time to the preparation process. There are numerous preparation tasks which can be done which should help. The following provides such ideas:

 


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