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Which example is NOT a part of the electromagnetic spectrum?
microwaves
radio waves
electricity
purple light

The answer is:  "500 mcg" .


Given 0.5 mg . 

Note:  Given 1000 mcg = 1 mg ;  which is true; and is an "exact conversion" ;

Note:  "mcg" = "microgram(s)" ; 
           "mg" = "milligram(s)" .


0.5 mg =  __?___  mcg ? ;


0.5 mg ( 1000 mcg/ 1 mg) = __?__ mcg ? ;

The units of "mg" cancel out to "1" ; since "mg/mg" = 1 ; 

and we have:  " (0.5) * (1000 mcg) = 500 mcg .

The answer is:  "500 mcg" .