Using the mnemonic roy g. biv to remember the colors of the rainbow in the order of wavelength illustrates the use of

It illustrates the use of an acronym to recall topics you need to remember. It is easier too recall these acronyms and then substitute the appropriate values or words into said acronym. There may be another name for this but I'm not sure of whay it is.

For me a person with a phd and who knows what there talking about.i know the chances of a radiation leak is low but if it does the area within a 96.3 mile radius would be unusable because of contamination

Ibelieve the answer is d. macula  hope my answer has you : )