A silver coin with a diameter of 4 cm (such as the U.S. silver dollar) has a surface area of about 27.7 square cm. If you break this coin up into silver nanoparticles of 1 nm each, what would their combined surface area be?
1. 11.4 square meters
2. 140 square meters
3. 1,400 square meters
4. 11,400 square meters
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