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Physics

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Wavelengths (8th Grade Physics)

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Physics
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Waves
Physics
Optics
Wave mechanics
Geometrical optics
Physical optics
Wave
Crest
Longitudinal wave
Diffraction
Interference
Refraction

Waves Please use Microsoft Powerpoint, and only Microsoft Powerpoint 2013 or later. Thank you! ?#? TABLE OF CONTENTS Wavelength Crest Trough High Frequency vs. Low Frequency Transverse Wave Longitudinal Wave Reflection Refraction Diffraction Constructive Interference Destructive Interference Incident & Reflected Wave WAVELENGTH The wavelength of a wave is the the distance between two crests or two troughs. Table of Contents CREST The highest point the particles of a medium move away from their resting position is the crest of a transverse wave. Table of Contents TROUGH The trough of a transverse wave is the lowest point the particles of a wave?s medium move downward from their resting position. Table of Contents HIGH FREQUENCY VS. LOW FREQUENCY

Elements of Design

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Physics
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Design
Visual design elements and principles
Drawing
Visual arts
Structure

Elements of Design Straight Lines This steel beam is an example of straight lines in design because it gives the steel beam definition, and a feeling that the beams are extremely stable. The straight lines make this design seem better because It adds a nice detail and allows you to know that this object is in fact made out of steel. Curved or Jagged Lines The pillow is an example of curved lines in design because it makes the pillow look soft in the drawing. The curved make this design seem better because it adds very good detail to the drawing giving it a very realistic feeling. Heavy Lines

Review Phys 214

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22_1?Review May?2016 M.?Burkardt?? NMSU?? PHYS?214?? Spring?2016 1 Phys214 Electricity & Magnetism Review part 1 Fields and Sources of Fields Point Charges as Sources of Electric Field Review q? q? ?P How do you determine the electric field (direction and magnitude) at point P? d a Electric Dipole Shown is only a ?slice? through a 3-dim. electrical field. Note: The number of lines leaving the positive charge equals the number terminating at the negative charge. Electric fields of separate charges add as vectors. Gauss?s Law Surface Integral of Electric Field enc 0 Qd ?? E A ?? ?? ? If net charge Q is enclosed by an arbitrary surface, the electric flux through the surface is Gauss?s law can be used to relate the electric field to the enclosed net charge.

RLC Circuits

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Physics
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19_2?AC?Circuits?Intro Apr/20/2016 M.?Burkardt?? NMSU?? PHYS?214?? Spring?2016 1 Phys214 Electricity & Magnetism AC Circuits: Reactance, Impedance RLC Series Circuit AC Circuits: Current vs. Voltage Connect circuit element directly to voltage Resistor: RV R I? ? ? C QV C? ? L dV L Idt? ? ? Inductance: Capacitor: max sin( )V V t?? ? max1 n )si (VI tR RV ?? ? ?? current in phase with voltage max cos( )dI Q C Cd Vdt V tdt ? ?? ? ? ? ?? ? current 90? ahead of voltage max cos1 1 ( )I V tt LVL d ??? ?? ??? current 90? behind of voltage AC Circuits: Current vs. Voltage Resistor: Inductance: Capacitor: current in phase with voltage current 90? ahead of voltage current 90? behind voltage Impedance and Reactance

Eddy Induction

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18_3?Induction:?Eddy?Currents Apr/8/2016 M.?Burkardt?? NMSU?? PHYS?214?? Spring?2016 1 Phys214 Electricity & Magnetism Induced Electric Fields, Eddie Currents, Generator Changing Magnetic Fields are Accompanied by Electric Fields Faraday?s law: As magnetic flux changes, an induced current flows. What causes the charges to move? Magnetic fields cannot do work, so the work done must be due to an electric field! This electric field cannot be conservative, because for a conservative field b aV d? ? ? E ?? ? ? 0d ?? E ?? ? ?? loop B d dt? ?? ? Induced Electric Fields magnetic flux through the loop: 0B NBA AIL? ? ?? ? ? ? ?? ? induced emf: 0Bind d N dIAdt L dt? ? ?? ? ? ? The changing magnetic flux induced an electric field in the conducting loop.

Lenz's Law

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18_1?Electromagnetic?Induction:?Magnetic?Flux? and?Lenz?s?Law Apr/4/2016 M.?Burkardt?? NMSU?? PHYS?214?? Spring?2016 1 Phys214 Electricity & Magnetism Electromagnetic Induction: Magnetic Flux, Lenz?s Law Motivation Hans-Christian ?rsted (1820): electric current causes a magnetic field Michael Faraday Can a magnetic field produce an electric field (and thus a current in a conductor)? Changing magnetic fields are sources of an emf and electric currents. Lecture Outline Currents (moving electric charges) Magnetic Fields Current-carrying wires are sources of magnetic fields. Card Readers Physics in Everyday Life A credit card stores it information as a magnetic pattern on the back of the card. Why is it necessary to ?swipe? the card, instead of holding

Current Source

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17_1?Currents?and?Moving?Charges?as?Sources? of?Magnetic?Fields Mar/28/2016 M.?Burkardt?? NMSU?? PHYS?214?? Spring?2016 1 Phys214 Electricity & Magnetism Sources of Magnetic Fields: Moving Charges and Currents Electromagnetism (Big Picture Summary) Electric charges can be separated, transferred. There are two kinds of charges. There are forces between charges. Magnets exert a force on moving electric charges. Moving electric charges (currents) or changing electric fields produce magnetic fields.El. charge can induce polarization in a nearby object. (Static effect) An oscillating charge creates a wave, that travels through space and carries energy, which oscillates between electric and magnetic fields: Electromagnetic waves

Particle in Fields Applications

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16_2?Applications?of?Charged?Particles?Moving? in?Magnetic?and?Electric?Fields Mar/21/2016 M.?Burkardt?? NMSU?? PHYS?214?? Spring?2016 1 Phys214 Electricity & Magnetism Applications of Motion of Charged Particles in Electric/Magnetic Fields Charged Particle in Electric and Magnetic Fields Review Electric and Magnetic Fields In an electric field there is always a force on a charged particle, which is independent of the speed of the particle. The force is directed perpendicular to the velocity vector ?The velocity changes direction, but its magnitude (speed) stays the same. ? no work is done. EF qE? Constant uniform electric fields change the speed of a charged particle (if no crossed magnetic field is also present). In a magnetic field a charged

Capitance

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14_1?Capacitance Feb/19/2016 M.?Burkardt?? NMSU?? PHYS?214?? Spring?2016 1 Phys214 Electricity & Magnetism Capacitance DEMO Materials: ? 2 sheets of aluminum foil, 1 sheet paper to make a capacitor ? Wimshurst machine ? Parallel plate capacitor ? voltmeter Lecture Outline ? Energy in the electric field ? What is a capacitor? ? Calculating Capacitance (for different geometries of capacitors) What is a Capacitor? Two conducting ?plates? (isolated electrically from each other) with opposite sign charge of the same magnitude |Q|. ? ? ?? ?? ? ? ? ? ? ? ? ? ? ? cross-section of a long cylindrical capacitor side view of a parallel-plate capacitor Charge Separation and Energy Stored in Electric Field What is a capacitor? A capacitor stores charge and energy.

General Nano-Science

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Nanosciences Vinh Nguyen Physics Department, Virginia Tech Email: [email protected], Tel: 540.231.3158 What is nanoscience? Nano C60 A comparison ? Integrated circuit Integrated circuit Nanoscience is not only physics, chemistry, engineering or biology... ALL OF THEM Nanoscience DNA Hemoglobin Carbon-based Nanomaterials C60 Fullerene Graphene Carbon nanotube Solar energy Contents of Class I. Nano-optoelectronics II. Micro/Nano-electronics III. Photonic crystals IV. Nano-mechanics V. Natural nanomaterials VI. Nano-plasmonics VII. Tools for nanoscale characterization and Nano-fabrication methods VIII. Carbon-based nanomaterials IX. Organic nano-optoelectronics X. Biomolecular nanoscience/Nano-biotechnology I. Nano-optoelectronics The Si revolution? First Transistor

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