Thursday, November 19, 2009

PS 104

When magnified 1,000 times by an electron microscope, the image of a certain circular piece of tissue has a diameter of 0.5 centimeter. The actual diameter of the tissue, in centimeters, is
(A) 0.005
(B) 0.002
(C) 0.001
(D) 0.0005
(E) 0.0002

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