<PRE><B>Question 1036172</B>
 In Bio 111 you learned that human hair can vary in diameter, but one estimate of the average diameter is 50 microns, how many 10-nanometer particles could be stacked across the diameter of a human hair? 
-----
50 microns = 50*10^-6 = 5.0*10-5
------
10 nanometers = 10*10^-9 = 1*10^-8
-------
Ans::: (5*10-5)/(10^-8) = 5*10^3 = 5000
-------------
Cheers,
Stan H.
-----------------</PRE>