Which of the following is true of the Balmer series of the hydrogen spectrum

Options

A. The entire series falls in the ultraviolet region
B. The entire series falls in the infrared region
C. The series is in the visible region
D. The series is partly in the visible region and partly in the infrared region

Answer

To determine which statement is true regarding the Balmer series of the hydrogen spectrum, we need to analyze the characteristics of the series and its position in the electromagnetic spectrum.

### Step-by-Step Solution:

1. **Understanding the Hydrogen Spectrum**:
The hydrogen spectrum consists of several series based on electron transitions between energy levels. The most notable series include the Lyman series, Balmer series, and Paschen series.

2. **Identifying the Balmer Series**:
The Balmer series corresponds to electron transitions from higher energy levels (n ≥ 3) down to the second energy level (n = 2).

3. **Position of the Balmer Series**:
The wavelengths of the Balmer series fall within the visible region of the electromagnetic spectrum. The visible spectrum ranges approximately from 400 nm (violet) to 700 nm (red).

4. **Evaluating the Options**:
- **Option A**: "The entire series falls in the ultraviolet region." This is incorrect because the Balmer series is not in the ultraviolet region; it is in the visible region.
- **Option B**: "The entire series falls in the infrared region." This is also incorrect, as the Balmer series does not fall in the infrared region.
- **Option C**: "The series is in the visual region." This is correct, as the Balmer series does indeed fall within the visible spectrum.
- **Option D**: "The series is partially in the visual region and partially in the infrared region." This is incorrect because the Balmer series is entirely in the visible region.

5. **Conclusion**:
Based on the analysis, the correct answer is **Option C**: "The series is in the visual region."