The Balmer series of hydrogen spectrum lies in: (A) visible region spectra (B) ultra violet spectra (C) infrared region spectra (D) γ-rays spectra

The correct answer is **(A) visible region spectra**.

### Explanation:

The Balmer series is a set of spectral lines that describe the emission of light by hydrogen atoms when the electron transitions from higher energy levels (n ≥ 3) to the second energy level (n = 2).

The Balmer series is part of the hydrogen emission spectrum and is visible because the wavelengths of these transitions fall within the range of wavelengths detectable by the human eye, which is approximately 400 nm to 700 nm.

- **Lyman series**: Transitions to \(n = 1\), lies in the **ultraviolet region**.
- **Balmer series**: Transitions to \(n = 2\), lies in the **visible region**.
- **Paschen, Brackett, and Pfund series**: Transitions to \(n = 3, 4, 5\) respectively, lie in the **infrared region**.

Since the Balmer series corresponds to transitions that produce light in the visible range, the correct choice is **(A) visible region spectra**.