A Hydrogen Atom Is in Its First Excited State (N

A hydrogen atom is in its first excited state (n = 2) .The linear momentum of the electron is (in kg .m/s)

A) 3 *10 ^{- 24}
B) 2 *10 ^{- 24}
C) 1 *10 ^{- 24}
D) 4 * 10 ^{- 24}
E) 3* 10 ^{- 15}