## Answers

E_n = -m_0 e^4/2 times (4 pi epsilon_0)^2 hstrok^2 middot 1/n^2 E_n = C/n^2 C = -m_e e^4/2 times (4 times epsilon_0)^2 hstrok^2 = -9.1 times 10^-31 times (1.6 times 10^-19)^4/2 times [4 times 3.14 times 8.85 times 10^-12]^2 times (1.05 times 10^-34)^2 = -= -59.63 times 10^-107/27.244 times 10^3 times 10^-24 times 10^-68 C = -2.18 times 10^--19/1/3.6 1.6 times 10^-19 ev = -13.6 ev E_n = -13.6 ev/n^2 C = -13.6 ev = -2.18 times 10^-18 J

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