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Flashcards in Electromagnetism Deck (77)
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1

Photon

smallest quantity of any time of EM radiation, atom of light

2

Properties of photons

Move at speed of light; travel in a sine wave

3

Properties of EM radiation

frequency, velocity, amplitude, wavelength

4

Frequency

Waves per second (Hz); =velocity/wavelength

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Velocity

distance in time (m/s); =frequency*wavelength

6

Amplitude

intensity of the wave

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Wavelength

A=velocity/frequency

8

Electromagnetic Wave equation

C = frequency*wavelength (frequency and wavelength are inversely proportional)

9

Inverse Square Law

I1/I2 = (d2/d1)^2

10

Wave-Particle Duality

Electromagnetic radiation has properties of both a wave and a particle (travel through space as a wave and have ability to ionize)

11

Electromagnetic Spectrum

Gamma Rays (highest energy, highest frequency, shortest wavelength), UV light, Visible light, Infared, microwaves, radiofrequency (lowest energy, lowest frequency, longest wavelength)

12

Radiopaque

absorb x-rays; bone (absorption-high atomic number)

13

Radiolucent

transmit x-rays; soft tissue (transmission-low atomic number)

14

Attenuation

light is transmitted but scattered (translucent)

15

Particle Model: Quantum Theory

x-rays are identified by their energy in eV (typically 10 keV - 50 MeV

16

Planck's Constant

photon energy is directly proportional to photon frequency
E=hf (h=4.15X10^-15 eVs)

17

Planck's Quantum Equation

F=E/h
E=hc/wavelength

18

Electrostatics

branch of physics that deals with stationary or resting charges

19

Electrification

process by which electrons are added or ejected from matter, making the atom charged (too few or too many electrons)

20

Electrons

smallest unit of electron charge

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methods of electrification

friction, contact, induction

22

Induction

electrical fields interact without touching

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Conductors

copper, aluminum

24

Insulators

plastic, rubber, glass, wood

25

Semi-conductors

silicon, germanium

26

Law #1 electrostatic force

like charges repel, unlike charges attract

27

Law #2 Coulomb's Law

electrostatic force is directly proportional to the product of the electrostatic charges and inversely proportional to the square of the distance between them

28

Law #3 Distribution

Electric charge distribution is uniform throughout the surface

29

Law #4 Concentration

concentration of charges on a curved surface is greatest where the curvature s greatest

30

Law #5 Movement

only negative charges can move in solid conductors