UH PHYS 1302 - Exam 2 Review (30 pages)

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Exam 2 Review



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Exam 2 Review

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exam 2 review


Pages:
30
School:
University of Houston
Course:
Phys 1302 - Introductory to Physics II
Unformatted text preview:

Exam 2 Review 23 1 Induced Electromotive Force EMF can be induced in second circuit if current in the first is changing When current in the first is stable 0 EMF in the second Magnitude of the induced current is proportional to the rate at which the magnetic field is changing 23 2 3 Magnetic Flux and Faraday s Law of Induction 23 4 Lenz s Law An induced current always flows in a direction that opposes the change that caused it If magnetic field faces one direction Magnetic field created by the induced current will be the opposite direction 23 5 Mechanical Work and Electrical Energy Induced EMF 23 6 Generators and Motors Motor Generator 23 7 Inductance 23 8 9 RL Circuits and Energy Stored in Magnetic Field 23 10 Transformers Can be used to change voltage supply 25 1 The Production of Electromagnetic Waves Electromagnetic waves EM are produced by oscillating charges Electric E and Magnetic B fields oscillate perpendicular to each other Both oscillate perpendicular to the direction of propagation 25 2 The Propagation of Electromagnetic Waves All EM waves in vacuum propagate at same speed Move more slowly in medium Doppler effect occurs when waves reflect from object sign for approaching sign for receding 25 3 The Electromagnetic Spectrum In vacuum relation between frequency f and wavelength given by The full range of frequencies of electromagnetic waves is called the electromagnetic spectrum 25 4 Energy and Momentum in Electromagnetic Waves Electric and magnetic field energy densities are equal in EM wave Given by Intensity Momentum 25 Polarization Polarization refers to direction of oscillating electric field 26 1 The Reflection of Light The law of reflection states that the angle of incidence equals the angle of reflection 26 2 Forming Images with a Plane Mirror Mirror image is upright but appears reversed right to left Mirror image appears to be the same distance behind the mirror that the object is in front of the mirror Mirror image is the same size as the object 26 3 Spherical Mirrors 26 4 Ray Tracing and the Mirror Equation do distance from the mirror to the object P ray reflects projects through the focal point di distance from the mirror to the image F ray reflects projects parallel to the axis f focal length C ray reflects back along its incoming path 26 5 The Refraction of Light n 1 for media 1 Reflected light is polarized 2 26 6 Ray Tracing for Lenses Concave lens Principle the same as for mirrors Convex lens 26 7 The Thin Lens Equation In thin lens approximation we can relate distance via focal length 26 8 Dispersion and the Rainbow 28 1 Superposition and Interference Superposition just means one can add two waves to get the total wave Interference will be constructive where the two waves are in phase b Destructive where they are out of phase c 28 1 Superposition and Interference For 2 light sources which are monochromatic and coherent these are conditions for interference m is an integer 0 1 2 etc 28 2 Young s Two Slit Experiment Constructive interference Destructive interference 28 3 Interference in Reflected Waves Conditions for interference change due to phase changes Constructive interference Destructive interference 28 3 Interference in Reflected Waves Reflection with film involve Phase change Wavelength change Changes the condition for interference once more Constructive interference Destructive interference n is index of refraction in film 28 4 Diffraction Diffraction involves the spreading of waves through a cavity barrier Sound waves will diffract around doors corners and other barriers m 2 m 1 m 1 m 2 Destructive interference 28 5 Resolution Diffraction through a small circular aperture results in a circular pattern of fringes If two sources have overlapping first fringes they cannot be resolved angle of first fringe Rayleigh s law on resolution Both sources of light pass through an aperture e g the eye microscope 28 6 Diffraction Gratings System with a large number of slits is called a diffraction grating Crystals can act as a diffraction grating Help determine the wavelength of X rays passing through The condition for constructive interference in a diffraction grating


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