<Tr> <Th> Transition of n </Th> <Td> 3 → 2 </Td> <Td> 4 → 2 </Td> <Td> 5 → 2 </Td> <Td> 6 → 2 </Td> <Td> 7 → 2 </Td> <Td> 8 → 2 </Td> <Td> 9 → 2 </Td> <Td> ∞ → 2 </Td> </Tr> <Tr> <Th> Name </Th> <Td> H - α / Ba - α </Td> <Td> H - β / Ba - β </Td> <Td> H - γ / Ba - γ </Td> <Td> H - δ / Ba - δ </Td> <Td> H - ε / Ba - ε </Td> <Td> H - ζ / Ba - ζ </Td> <Td> H - η / Ba - η </Td> <Td> Balmer break </Td> </Tr> <Tr> <Th> Wavelength (nm) </Th> <Td> 656.3 </Td> <Td> 486.1 </Td> <Td> 434.1 </Td> <Td> 410.2 </Td> <Td> 397.0 </Td> <Td> 388.9 </Td> <Td> 383.5 </Td> <Td> 364.6 </Td> </Tr> <Tr> <Th> Energy difference (eV) </Th> <Td> 1.89 </Td> <Td> 2.55 </Td> <Td> 2.86 </Td> <Td> 3.03 </Td> <Td> 3.13 </Td> <Td> 3.19 </Td> <Td> 3.23 </Td> <Td> 3.40 </Td> </Tr>

In balmer series of hydrogen atom spectrum which electronic transition causes third line