Calculate the wave length in angstroms of the photon that is emitted when an electron in the Bohr's orbit n=2 return

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Q 1116291179.     Calculate the wave length in angstroms of the photon that is emitted when an electron in the Bohr's orbit n=2 returns to the orbit, n=1 in the hydrogen atom. The ionization potential of the ground state hydrogen atom is 2.17xx10^-11  erg per atom.
JEE 1982
A

1296

B

1153

C

1221

D

1024

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(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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