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PROBLEM SET NO. 2
1. A thin, semitransparent film of gold (ρ = 19 300 kg/m
3
) has an area of 14.5cm
2
and a mass of 1.93 mg.
(a) What is the volume of 1.93 mg of gold? (b) what is thethickness of the film in angstroms, where 1 Ā =
10
-10
m? © Gold atoms havea
diameter of about 5 Ā. How many atoms thick is the film? Ans: 1x10
-10
m
3
; 690Ā;
138 atoms thick
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