Physics Final
Physics 104 with Jacobson at University of Maryland - College Park
About this deck
By: lex bann
Created: 2010-12-15
Size: 27 flashcards
Views: 89
Created: 2010-12-15
Size: 27 flashcards
Views: 89
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How are electromagnetic fields generated?
Generated by a wiggling charge
As electromagnetic waves go through an antenna, the electric field goes which way?
Back and forth
Pattern of electric field in a wave
Parallel
Pattern of magnetic field in a wave
Perpendicular
Polarization
Direction of the electric field vector
Index of Refraction
Factor by which light is slowed down in a material
Refraction
Bending of direction of wave at interface between two materials
Atomic Transition
Change of electron energy level
Laser pointers - Will the dot get smaller or spread out as it gets further?
It will spread out as it gets further
Laser light properties. Photons have (3)
1. Same wavelength/frequency
2. Same direction of propagation
3. Same phase (oscillations are in step w/ each other
What does LASER stand for?
Light amplification by stimulated emission of radiation
Stimulated Emission
Encourage atom to make transition by sending in an atom of the same type
What is a laser?
Way of producing light that has special properties
Two ways to make x-rays
1. Breaking radiation (slowing it down) (Brehm Strahlung)
2. Fluorescence
CT Scans
- Computed Tomography
- Pictures taken in all different angles and puts them together to find out the flaws in the body
Radiative Therapy
Destroy the bad tissue/damage bad DNA
Isotope
Different number of neutrons. same number of protons
Half-life
(1/2) x (time elapsed)/(1/2 life)
Brehm Strahlung
Slowing down radiation when high energy electron gets close to the nucleus. Then it carries out a photon.
What happens when a charge accelerates?
Distortions in the electric field lines propagate outward at the speed of light. These distortions amount to the electric part of electromagnetic waves.
Magnetic field is what to the electric field?
Perpendicular
When is radiation intensity the greatest?
When it is perpendicular to the antenna
EM waves have equal energy in what fields?
Magnetic and electric fields
Most efficient length of a dipole antenna for emission or absorption is...
One fourth of a wavelength
Bandwidth
- Range of AM and FM frequencies to transmit a given signal
- The more bandwidth, the more information it can transmit
- The bandwidth of FM is much greater
Visible Spectrum
Blue light has higher frequency and shorter wavelength than red
When electromagnetic radiation travels through a "transparent" material
It interacts with the material but is not absorbed or reflected. The interaction makes it slow down.
About this deck
By: lex bann
Created: 2010-12-15
Size: 27 flashcards
Views: 89
Created: 2010-12-15
Size: 27 flashcards
Views: 89
About StudyBlue
STUDYBLUE makes things that make you better at school.
Things like online flashcards with photos and audio.
Things like personalized quizzes and friendly reminders about when (and what) to study next.
Think of it as a digital backpack™: access to all of your study materials online and on your phone.
STUDYBLUE exists to make studying efficient and effective for every student, for free. Join us.
“I have been getting MUCH better grades on all my tests for school. Flash cards, notes, and quizzes are great on here. Thanks!”
Kathy
Kathy