Balmer series lies in which region of electromagnetic spectrum

Options

A. ultraviolet
B. infrared
C. visible range
D. microwave

Answer

To determine the region of the electromagnetic spectrum where the Balmer series lies, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Balmer Series**: The Balmer series is a set of spectral lines corresponding to the transitions of electrons in a hydrogen atom from higher energy levels to the second energy level (n=2).

2. **Identify the Wavelength Range**: The wavelengths for the Balmer series range from approximately 400 nanometers (nm) to 780 nanometers (nm).

3. **Compare with Electromagnetic Spectrum Regions**:
- **Ultraviolet (UV)**: The UV region ranges from about 1 nm to 400 nm. Since the upper limit of the Balmer series (780 nm) exceeds this range, it cannot be classified as UV.
- **Visible Light**: The visible spectrum typically ranges from about 400 nm to 750 nm. The lower limit of the Balmer series (400 nm) falls within this range, and the upper limit (780 nm) is just outside the visible range but still includes the visible light spectrum.
- **Infrared (IR)**: The IR region starts from about 750 nm and extends to 2.5 micrometers (2500 nm). Since the Balmer series starts at 400 nm, it does not fall into this category.
- **Microwave**: The microwave region ranges from about 25 micrometers (25000 nm) to 1 millimeter (1000000 nm). This is far beyond the range of the Balmer series.

4. **Conclusion**: Based on the comparisons, the Balmer series primarily lies within the visible region of the electromagnetic spectrum, particularly at the boundary of visible light.

### Final Answer:
The Balmer series lies in the **visible range** of the electromagnetic spectrum.