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A 12.5 eV electron beam is used to excit...

A `12.5 eV` electron beam is used to excite a gaseous hydrogen atom at room temperature. Determine the wavelengths and the corresponding series of the lines emitted.

A

2 lines in the Lyman series and 1 line in the Balmar series

B

3 lines in the Lyman series

C

1 line in the Lyman series and 2 lines in the Balmar series

D

3 lines in the Balmer series

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