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r = 0.53* 10 ^ - 10 m = 5,3* 10^-11 m
n = 1
h = 6,626 * 10^-34 J * s
mvr = nh / 2π
v = h / 2πmr
v = 6,626 * 10^-34 / 2 * 3,14 * 5,3 * 10 ^ - 11 * 9,1 * 10^ -31 = 0,0218 * 10^8 m/s
v = 0,0218 * 10^8 m/s = 2180 * 10^3 m/s = 2180 km/s