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PHY 112 Online Credit: David Weaver by Mind Map: PHY 112 Online

Credit: David Weaver
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PHY 112 Online Credit: David Weaver


What is Physics?

Physics is a study of what is. It is not necessarily real because it is a human concept and not the nature itself. It is the study of such.

Physics discussion (please read the note)

Study of matter, of what is


Electricity is the flow of electrons from a negative charge to a positive charge. Electricity generates magnetic field.

Forces, Fields and Electricity discussion (please read the note)

Moving electrons, Charge, force-inducing electrical property, Voltage, electrical tension between two points, Resistivity, material opposition of electric current, Electrical resistance = dVoltage / Electric Current. Measured in Ohms, Known as Ohms Law, Conductivity, ability to conduct electric current, Magnetism, Electromagnetism, Lenz's Law

Forces and Momentum

Magnetic Field can create a momentum

Work, Energy Storage and Transfer

Properties of Matter

Mass and Charge, number of neutrons and total atomic mass determines the characteristics of an atom, Periodic table uses that information to organize the elements, Atoms can be stable or unstable, unstable atoms decay through radioactivity, alpha radiation = He loss, beta radiation = conversion of neutron to proton and +e-, gamma radiation e- mass loss, releases a lot of energy with fission or fusion nuclear reactions, power plants use these reactions by limiting the amount of radioactive material present, thus preventing a critical mass, different number of neutrons in the same element determines its isotopes, Atomic weight, atomic mass unit, mass defect, atomic number, isotopes, stable, unstable, decay, radioactive, alpha, He atoms, beta, electrons, gamma, mass defect, releases a lot of energy, energy can be harvested, weapons, electricity, research, half-life


Effectively communicate qualitative and quantitative information orally and in writing.

Class-wide discussions and e-mail conversations, teaching each other what we have learned thus far.

Explain the application of fundamental physical principles to various physical phenomena.

Neat videos, e-mail conversations.

Apply appropriate problem-solving techniques to practical and meaningful problems using graphical, mathematical, and written modeling tools.

Using camera and other available parts to make a coil gun. Using our knowledge of electricity and circuitry to accomplish a different goal than that what the device was originally made for.

Work effectively in collaborative groups.

Project #1 - Research, team collaboration to get the coilgun working. Primary steps initiated.

Electromagnetic Radiation

Common Characteristics

Travels at speed of light

The higher the frequency, the more likely the radiation is ionizing

Differences in wavelength results in different colors

Energy carried is dependent upon frequency and amplitude

Propagation may occur both in vacuum and material


380-435 nm - Violet 436-500 nm - Blue 501-520 nm - Cyan 521-565 nm - Green 566-590 nm - Yellow 591-625 nm - Orange 626-740 nm - Red

Anything with higher frequency will be ionizing, Ex: mutations due to damage to DNA

Anything at the visible spectrum or below is safe, Ex: Infrared, Radio waves, etc.

Secondary colors may be created by overlapping primary color EMR

Alternative approach is to use subtractive model by mixing red, yellow, blue, or magenta, yellow, and cyan to create necessary colors

NOT SURE ABOUT: Physical vs. Physiological light


Reflection, When a ray strikes a surface, it will partially reflect at an equal but opposing angle

Refraction, When a way enters a surface / material, it may bend and change its velocity

Dispersion, When light passes through a material, the wave's different frequencies will travel at different velocity while in that material (according to their frequencies)

Diffraction, Bending or spreading out of waves around small objects or openings

Interference, Two waves positioned into a new wave frequency

Polarization, Helps determine the orientation of wave oscillations

Absorption, EMR may be absorbed by a material that it enters

Scattering, The trajectory of EMR may be deviated from a simple straight line

Transparency, Transparent materials can be passed through with EMR freely, Translucency allows light to pass diffusively, The opposite of translucency is opacity

Fluorescence, Property that allows a material to emit a different wave EMR after absorbing another frequency wave

Phosphorescence, Unlike fluorescence, phosphorescence does re-emit waves immediately, it may do so at much slower rate of a lower frequency EMR

Works Cited

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