modern physicsmodern physics - school of physicsphysics.ipm.ac.ir/people/ashafie/courses/modern...
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Modern PhysicsModern Physics1
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Programm
Special Relativity Galileo and Lorentz transformation Special Relativity – Galileo and Lorentz transformation. Wave - particle dualism of light Quantum mechanics postulates. Schrodinger equation and its
application (quantum well tunneling effect)application (quantum well, tunneling effect). Quantum effects: lasers, electron and tunneling microscopes. Hydrogen atom. Quantum numbers. Spin. NMR operation.
M l t t M l l b di S lid t t Many – electron atom. Molecular bondings. Solid state bondings.
Crystal structures . Band theory of solids. Metals, insulators, semiconductors superconductors high and low temperaturesemiconductors, superconductors high and low temperature.
Dynamics of electrons in a solid state. Electrons and holes in Semiconducting nanostructures. N l St d k f Nucleus. Strong and weak forces Fusion and fission reactions. Elementy particles. The Universe time line
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TEXT BookTEXT Book
Elementary modern physics. Ri h d T W id R b t L S llRichard T. Weidner, Robert L. SellsQuantum Physics.Quantum Physics.
Robert Martin EisbergElementary Modern Physics.
Atam Parkash AryaAtam Parkash AryaMy Lecture note given in class
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GradingGrading
Homework……………..2 pointsQuizzes 2 pointsQuizzes………………...2 pointsThree Exams……….....9 pointsFinal Exam…………….5 pointsTerm paper 2 points*Term paper…………….2 points*
*- optional: if not will be added to exams
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Understanding the ideas of each lecture requires the knowledge of thelecture requires the knowledge of the
previous lectures.
If you keep upIf you keep up, you won’t end up looking likeup looking like this the night before the quizzes!q
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State of Physics cira 1895State of Physics cira 1895
Conservation Laws• Energy
• Linear & Angular Momentum
Statistical Mechanics• 3 Laws of Thermodynamics
• Kinetic Theory
Electricity & MagnetismMaxwell Equations (c 1880)• Gauss’ Law•Faraday’s Law g• Kinetic Theory Faraday s Law•Ampere’s Law•No magnetic monopoles
Mechanics (Gravity) Newton’s Laws (c 1640)( )1-Law of inertia2-F=ma3-Equal and opposite reactions
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RELATIVISTIC PHYSICSThe study of phenomena
th t t k l ithat takes place in a frame of reference that isframe of reference that is in motion with respect to ot o t espect to
the observer.
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Big Bang Timelineg g
We are here8
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Atomic ParticlesAtomic Particles
Atoms are made of protons, neutrons and electrons
99.999999999999% of the atom is empty space Electrons have locations
ldescribed by probability functions
nucleus
mp = 1836 meNuclei have protons and
neutrons
p e
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Atomic sizesAtomic sizes
Atoms are about 10-10 mNuclei are about 10-14 mNuclei are about 10 m Protons are about 10-15 m The size of electrons and The size of electrons and
quarks has not been measured but they are atmeasured, but they are at least 1000 times smaller than a protonthan a proton
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What is Light?What is Light?
Properties of light Reflection Refraction Reflection, Refraction
A property of both particles and wavesInterference and Diffraction Interference and Diffraction Young’s double slits
A P t f W O l A Property of Waves Only Polarisation
A Property of Waves Only
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Classical PhysicsClassical Physics
Light is a waveYoung’s Double Slit Experiment g pFaraday’s experimentsMaxwell’s equationsMaxwell s equations
E0
BE
B 0
JEB
tE
01
t 000
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The Birth of the QuantumThe Birth of the Quantum Max Planck The energy contained in radiation is related
to the frequency of the radiation by the l ti hirelationship
nhnhfE
n is a positive integer called the quantum b
f
number f is the frequency of the oscillation
A di t k t f l t t A discreet packet of energy, later to become known as “a photon”
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Implications of Planck’s Law
The energy levels of the molecules must energy4hf
energy n
be discreetOnly transitions by
432
energy4hf3hf2hfOnly transitions by
an amount E=h are allowed
210
2hf1hf0allowed
The implication is that light is discreet These quantum levels are now
0
that light is discreet or quantised
These quantum levels are now known as number states
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Photoelectric effect
When light strikes the When light strikes the cathodecathode, electrons , electrons are emittedare emittedare emittedare emittedElectrons moving between the two plates Electrons moving between the two plates constitute a currentconstitute a current 15
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Photoelectric EffectPhotoelectric Effect Explanation
Einstein: the quanta of energy are in fact localised “particle like” energy packets
Each having an energy given by hf Emitted electrons will have an energy given
bby hKmax
Where is known as the “work function”of the materialof the material
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Properties of matterProperties of matter
Consists of discreet particles Atoms Molecules etc Atoms, Molecules etc.
Matter has momentum (mass)A well defined trajectoryDoes not diffract or interfereDoes not diffract or interfere
1 particle + 1 particle = 2 particles
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Louis de Broglie1892 - 1987
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Wave Properties of MatterWave Properties of Matter
In 1923 Louis de Broglie postulated that perhaps matter exhibits the same “duality” that light exhibits
Perhaps all matter has both characteristics as well For photons, hhE
hc
hcEp
Which says that the wavelength of light is related to itsWhich says that the wavelength of light is related to its Which says that the wavelength of light is related to its Which says that the wavelength of light is related to its momentummomentum
M ki th i f tt fi dM ki th i f tt fi d
hh
Making the same comparison for matter we find…Making the same comparison for matter we find…
mvp
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Quantum TheoryQuantum Theory
Particles act like waves?!The best we can do is predict theThe best we can do is predict the
probability that something will happen.
Heisenberg Dirac Schrodinger 20
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Quantum mechanicsQuantum mechanics
Wave-particle duality Waves and particles have interchangeable Waves and particles have interchangeable
properties This is an example of a system with This is an example of a system with
complementary propertiesf The mechanics for dealing with
systems when these properties become y p pimportant is called “Quantum Mechanics”Mechanics
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The Uncertainty Principle
Measurement disturbes the systemMeasurement disturbes the system
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The Uncertainty PrincipleThe Uncertainty PrincipleClassical physics
Measurement uncertainty is due to limitations of Measurement uncertainty is due to limitations of the measurement apparatus
There is no limit in principle to how accurate a There is no limit in principle to how accurate a measurement can be made
Quantum Mechanics There is a fundamental limit to the accuracy of a
measurement determined by the Heisenberg t i t i i luncertainty principle
If a measurement of position is made with precision x and a simultaneous measurement ofprecision x and a simultaneous measurement of linear momentum is made with precision p, then the product of the two uncertainties can never be l th h/2less than h/2
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The Uncertainty PrincipleThe Uncertainty Principle
Virtual particles: created due to the UP
E t E t
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In Search of the Higgs BosonIn Search of the Higgs Boson
Higgs boson is “cosmic molasses” – the Holy Grail of particle physicsHoly Grail of particle physics
Interactions with the Higgs Field are theorized to give all the particles their masses
LHC detectors should be able to confirm or disprove initial hints for Higgs at E=115or disprove initial hints for Higgs at E=115GeV
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27relativeVelocity.html (Command Line)
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اينرسنسبيت مختصات دستگاههای دستگاه های مختصات اينرسی-نسبيت
ا اتق اا ااتگا ت ااا اين .است استواراينرسیدستگاه های براساسنيوتنقوانين•.است شده کد نيوتن اول قانون در مطلب
نشود وارد نيرويی جسم يک به مختصات دستگاه يک در اگر•دهد،ادامهراخوديکنواختحرکتبهياوساکنجسمآنو منو ور بيونج ر وي.گويند اينرسی را مختصات دستگاه آن
دارنديکنواختحرکتهمبهنسبتاينرسدستگاههای• .دارند يکنواختحرکتهمبه نسبتاينرسیدستگاه های• جهت در V سرعت با هم به نسبت که اينرسی دستگاه دو اگر•
ان اشنک’SSتگاخ x،دستگاهبخوانيدSو S’،باشندحرکتدر:
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طور همين ورو ين وو ه
در اين صورتا
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دستگاهيکبهاينرسیدستگاهيکازکههنگامیپس• یي زیپس ر ي بي و کند نمی تغيير حرکت های معادله رويم می ديگر اينرسی
ناوردانيوتنقوانينگاليلهتبديالتدرديگرعبارتبه ناوردانيوتن قوانينگاليلهتبديالت درديگرعبارتبه.مانند می
ها نهاتگاهتهناظ کختلفا يکمختلف اينرسیهایدستگاه بهپيوستهناظرهای•.کنند می تعبير طور يک را پديده
اينرسی های سيستم بين تواند نمی مکانيکی ی پديده هيچ•.بگذاردتفاوت رو .ب
ثابت توان نمی مکانيکی آزمايش هيچ ی وسيله به بنابراين•بقيهواستسکونحالدراينرسدستگاهيککهکرد بقيهواست سکونحالدراينرسی دستگاهيککهکرد
.دارند يکنواخت حرکت آن به نسبت
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شکلتغييرتبديالتاينتحتماکسولمعادالتاما شکلتغيير تبديالتاينتحتماکسولمعادالتاما .می دهند
اط غ ال ا ا فا ا ا ا پس می توان با استفاده از پديده های الکترومغناطيسی.بين دستگاه های اينرسی مختلف تمايز قائل شد
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شنا در طول رودخانهمتحرك محيط در حركت در محيط متحركحركت
u- ساحل به نسبت رودخانه سرعتآ c-ساكنآبدرشناگرسرعت
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شنا در عرض رودخانه
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يگيريمدرسي كه از شناگر مي ر از ي يريمر
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.انيشتين و ديگران عدم وجود اتر را مدعي شدند45
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