You want to confine an electron in a box (an infinite well) so that its ground state energy is 5.0 × 10-18 J. What should be the length of the box? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg)
A) 0.11 nm
B) 0.22 nm
C) 0.15 nm
D) 0.18 nm
Answer: A
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