(i) First line of a series : It is called line of longest wavelength of line of smallest energy'.
(ii) Series limit or last line of a series : It is the line of shortest wavelength or line of highest energy.

Options

A. T F
B. F T
C. T T
D. F F

Answer

To analyze the given statements regarding the first line and the series limit in a spectral series, we can break down the solution step by step.

### Step-by-Step Solution:

**Step 1: Understand the Definitions**
- The first line of a series refers to the transition that produces the longest wavelength (or the smallest energy) in that series.
- The series limit (or last line of the series) refers to the transition that produces the shortest wavelength (or the highest energy) in that series.

**Step 2: Analyze the First Statement**
- The first statement claims that the first line of a series is the line of longest wavelength or the line of smallest energy.
- This is correct because, in any spectral series, the first line corresponds to the transition from the first energy level to the second energy level (n1=1, n2=2), which indeed has the longest wavelength and therefore the smallest energy.

**Step 3: Analyze the Second Statement**
- The second statement claims that the series limit or last line of a series is the line of shortest wavelength or the line of highest energy.
- This is also correct because the series limit corresponds to the transition where the electron moves from an energy level to infinity (n2 approaches infinity), resulting in the shortest wavelength and the highest energy.

**Step 4: Conclusion**
- Both statements are correct. Therefore, the answer to the question is that both statements accurately describe the characteristics of the first line and the series limit in a spectral series.

### Final Answer:
Both statements are correct.

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