# Convex Mirror

(3 pages)
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## Convex Mirror

Lecture number:
31
Pages:
3
Type:
Lecture Note
School:
The University of Vermont
Course:
Phys 012 - Elementary Physics
Edition:
1
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Unformatted text preview:

Lecture 32 Outline of Last Lecture I. Particle Wave Duality a. Particles can behave like waves and exhibit interference effects. i. Electrons and other particles can exhibit wave-like properties. II. Black Body Radiation a. Black body: an ideal system that absorbs all radiation incident on it, thus appearing black i. Common model: hollow spherical container with small opening, increases temperature as it absorbs radiation b. For black body radiation, there is a characteristic distribution of wavelengths, dependent on the temperature of the object. c. Wien’s Law: λmaxT = 2.898 x 10-3 i. As T increases, λmax decreases. ii. Ultraviolent catastrophe: prediction of classical physics that an ideal black body at thermal equilibrium will emit radiation with infinite power d. Total power of radiation emitted depends on temperature. i. P = σAeT4 1. σ = Stefan-Boltzmann constant = 5.7 x 10-8 W/(m2K4) 2. A = surface area of object 3. e = emissivity (0 to 1), how easily an object emits/absorbs radiation, perfect black bodies have emissivity of exactly 1 4. T = temperature (must be in Kelvins, °C + 273) Physics 012 1st Edition

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