Which of the following statements is correct ?

Options

A. Lyman series is continuous
B. Balmer series lies inn ultraviolet region
C. Paschen series lies in infrared region
D. Brackett series lies in visible region

Answer

To determine which statement is correct regarding the hydrogen spectrum, we will analyze each statement step by step.

### Step 1: Analyze the Lyman Series
The first statement claims that the Lyman series is continuous.

- The Lyman series corresponds to electron transitions from higher energy levels (n ≥ 2) to the ground state (n = 1).
- The energy levels in hydrogen are quantized, meaning that the energy differences between these levels are fixed and discrete.
- Therefore, the emitted wavelengths corresponding to these transitions are also discrete and not continuous.

**Conclusion:** The Lyman series is not continuous. This statement is incorrect.

### Step 2: Analyze the Balmer Series
The second statement claims that the Balmer series lies in the ultraviolet region.

- The Balmer series corresponds to transitions from n ≥ 3 to n = 2.
- The wavelengths emitted during these transitions fall within the visible spectrum (approximately 400 nm to 700 nm).

**Conclusion:** The Balmer series does not lie in the ultraviolet region. This statement is incorrect.

### Step 3: Analyze the Paschen Series
The third statement claims that the Paschen series lies in the infrared region.

- The Paschen series corresponds to transitions from n ≥ 4 to n = 3.
- The emitted wavelengths for these transitions fall within the infrared spectrum (greater than 700 nm).

**Conclusion:** The Paschen series does lie in the infrared region. This statement is correct.

### Step 4: Analyze the Brackett Series
The fourth statement claims that the Brackett series lies in the visible region.

- The Brackett series corresponds to transitions from n ≥ 5 to n = 4.
- The wavelengths emitted during these transitions fall within the far-infrared region, which is not visible.

**Conclusion:** The Brackett series does not lie in the visible region. This statement is incorrect.

### Final Answer
The correct statement is: **The Paschen series lies in the infrared region.**

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