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PHYS1252 Exam 2

QuestionAnswer
Diffraction When waves deviate from straight lines due to an obstacle or aperture
dsin(theta) The path length difference between any 2 successive slits
When does diffraction occur Anytime waves encounter a barrier or opening .. you can sometimes see diffraction patterns in shadows
Resolution Concept of how far apart 2 sources of light (or what angle) have to be until they can be identified as separate
When can 2 sources of light not be separated If the first dark fringe from one source lies on the central bright fringe of the other, they cannot be separated
Rayleigh's Criterion Condition where the location of the first dark fringe that determines the size of the central spot (sintheta=1.22lambda/D)
Example of circular apertures Our pupils
What causes a bigger central spot? Increased wavelength and larger D
What causes a smaller central spot Decreased wavelength and smaller D
Conductor A material whose conduction electrons are free to move throughout. Most metals are good conductors.
Electric Flux Measure of the electric field perpendicular to the surface
SI Unit for electric flux N*m^(2)/C
What is the electric flux if the electric field is tangent everywhere to the curved surface? Zero
Sign convention for field lines that leave the enclosed volume of the surface Positive
Sign convention for field lines that enter the enclosed volume of the surface Negative
When to use Gauss's Law In systems with high symmetry
Gauss's Law The electric flux through a closed surface is proportional to the charge enclosed by the surface
Conservative Force If the work done by a force depends only on the final and initial positions and does not depend on the path taken
What is the SI unit for potential difference Volts
Electric potential Changes in potential energy per unit charge, a way to measure the energy to move an amount of charge
How does the electric field relate to potential? The electric field relates to how fast the potential is changing. Moving in the direction field corresponds to a decrease in electric potential.
Created by: ephemeral
 

 



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