Blackbody Radiation Curve Explained with Sample Problems and Solutions

00:02 Temperature dependence of EM radiation
00:42 Black-body is an ideal model
01:03 Blackbody is a perfect absorber and perfect emitter
01:15 Black body at thermal equilibrium
01:50 Cavity Radiator as physical implementation of blackbody
03:24 Infrared Region
03:33 Visible Light Spectrum
03:42 Ultraviolet Region
03:55 Experimental Results
04:25 Predictions of Rayleigh-Jeans Equation
05:20 Ultraviolet Catastrophe Explained
05:39 Quantization of Oscillator Energy as solution to the decrease in Intensity
05:53 Planck's Law of Black-body Radiation
06:15 Wien's Displacement Law
06:19 Stefan's Law
07:16 Intuitive Explanation of Gradual Decrease of Energy
07:21 What is actually oscillating? Are they atoms? or electrons?
08:02 Discrete energies of particles and quantum radiation
08:12 Planck's constant
08:20 Conceptual approach to absorption and emission of energy
07:43 Visualizing vibrating atoms and electron jumps
08:33 Non-allowable energies can result to atoms breaking free from lattice.
08:57 Non-allowable energies can result to electrons jumping away from possible shells.
09:47 Sudden drop in radiance because of high frequencies or short wavelength photons

10:48 OpenStax University Physics Volume 3 Chapter 6 Photons and Matter Waves
Practice Problem 55 Answer
A 200-W heater emits a 1.5-μm radiation. (a) What value of the energy quantum does it emit? (b) Assuming thatthespecificheatofa4.0-kgbodyis 0.83kcal/kg·K, how many of these photons must be absorbed by the body to increase its temperature by 2 K? (c) How long does the heating process in (b) take, assuming that all radiation emitted by the heater gets absorbed by the body?

18:27 OpenStax University Physics Volume 3 Chapter 6 Photons and Matter Waves
Practice Problem 57 Answer
(a) For what temperature is the peak of blackbody radiation spectrum at 400 nm? (b) If the temperature of a blackbody is 800 K, at what wavelength does it radiate the most energy?

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