question_answer

A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. Hydrogen atoms would be excited up to nth energy level the hence the wavelength obtained first member of Balmer series is\[{{\lambda }_{B}}\], then.

A)  \[{{\lambda }_{B}}=1415\overset{\text{o}}{\mathop{\text{A}}}\,\]

B)  \[{{\lambda }_{B}}=1215\overset{\text{o}}{\mathop{\text{A}}}\,\]

C)  \[{{\lambda }_{B}}=6563\overset{\text{o}}{\mathop{\text{A}}}\,\]

D)  \[{{\lambda }_{B}}=8523\overset{\text{o}}{\mathop{\text{A}}}\,\]