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A hydrogen atom at rest is initially in an excited state corresponding to n = 5....

A hydrogen atom at rest is initially in an excited state corresponding to n = 5.

a- Give the quantum numbers (l) and (m) which correspond to n = 5

b- What is the ionization energy of the atom in this state?

c- What is the frequency of the photon emitted when it returns to its ground state n = 1?

d- Estimate the momentum and the kinetic energy of the atom's recoil during the photon emission.

mH= 1.007825? 1? = 1.6605. 10^-27kg

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