Question

when electronic transitions come back to the ground state, all transitions falling back to n=2, are ___ series and fall in the ___ region of e.m. spectrum a lyman, visible b balmer, visible c planck, uv d brackett, ir

Explanation:

In atomic physics, the Balmer series consists of electron transitions in hydrogen atoms where electrons fall back to the \( n = 2 \) energy level. These transitions correspond to wavelengths in the visible region of the electromagnetic spectrum. The Lyman series is for transitions to \( n = 1 \), Paschen to \( n = 3 \), and Brackett to \( n = 4 \) (with Paschen and Brackett in infrared or other non - visible regions in general). So the correct option is the one with Balmer and visible.

Answer:

B. Balmer, Visible