There are a number of ways energy can be transferred, but in this video we are going to focus on how objects transfer energy by electromagnetic radiation. We will discuss the Stefan-Boltzmann Law and how we can use this to find out the net power transfer of electromagnetic radiation from an object; We'll define what a black-body is; we'll look at why objects at different temperatures emit different wavelengths of light - more specifically, the intensity of black-body radiation vs wavelength for three different temperatures; and finally, we calculate the power output (of electromagnetic radiation) from a molten ball of glass.

00:00 Different means of Energy Transfer
01:45 Different temperatures emit different wavelengths
03:42 What is a Black-Body?
04:49 Emissivity Definition
05:24 Stefan-Boltzmann Law
08:00 Example Problem

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