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About how fast does the electron move in hydrogen's ground-state orbit?
A2.2 × 10⁴ m/s
B3.0 × 10⁸ m/s
C2.2 × 10⁸ m/s
D2.2 × 10⁶ m/s
Answer & Solution
Correct answer: D. 2.2 × 10⁶ m/s
Equating Coulomb and centripetal forces at r = 5.3 × 10⁻¹¹ m gives v near 2.2 × 10⁶ m/s.
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