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## Main Question or Discussion Point

Newbie here with a question on an article I read on the PBS website regarding the e=mc^2 equation and whether or not it is factualy accurate (yet extremeley simplified) for a non-mathematical layman's description of the equation.

Regarding the reasoning for the speed-of-light in the equation, the article in part reads:

"So why would you have to multiply the mass by the speed of light to determine how much energy is bound up inside it? The reason is that whenever you convert part of a piece of matter to pure energy, the resulting energy is by definition moving at the speed of light. Pure energy is electromagnetic radiation—whether light or X-rays or whatever—and electromagnetic radiation travels at a constant speed of roughly 670,000,000 miles per hour."

The article, of course, then explains the reasons for squaring and so forth, but in regards to the aforementioned paragraph on c, is it correct on a layman's level? If not, what parts of the preceding description is wrong (or right)?

Thanks

Regarding the reasoning for the speed-of-light in the equation, the article in part reads:

"So why would you have to multiply the mass by the speed of light to determine how much energy is bound up inside it? The reason is that whenever you convert part of a piece of matter to pure energy, the resulting energy is by definition moving at the speed of light. Pure energy is electromagnetic radiation—whether light or X-rays or whatever—and electromagnetic radiation travels at a constant speed of roughly 670,000,000 miles per hour."

The article, of course, then explains the reasons for squaring and so forth, but in regards to the aforementioned paragraph on c, is it correct on a layman's level? If not, what parts of the preceding description is wrong (or right)?

Thanks