which of the following is not among shortcomings of bohr 's modal ?

Options

A. bohr theory could account for the fine lines in the atomic spectrum
B. Bohr theory was unable to account for the spliiting of the spectral lines in the pressence of magnetic field
C. bohr theory failed for He atom
D. It did not give information about energy level

Answer

To determine which of the following options is not a shortcoming of Bohr's model, we will analyze each option step by step.

### Step 1: Analyze the Options
We have four options to evaluate regarding Bohr's model of the atom:

1. **Bohr's theory could account for the fine lines in the atomic spectrum.**
2. **Bohr's theory was unable to account for the splitting of the spectral lines in the presence of a magnetic field.**
3. **Bohr's theory failed for the helium atom.**
4. **Bohr's theory did not give information about energy levels.**

### Step 2: Evaluate Each Option
- **Option 1:** "Bohr's theory could account for the fine lines in the atomic spectrum."
- This statement is **false**. Bohr's model could not explain the fine structure of spectral lines; it only provided a basic understanding of hydrogen's spectral lines.

- **Option 2:** "Bohr's theory was unable to account for the splitting of the spectral lines in the presence of a magnetic field."
- This statement is **true**. Bohr's model does not account for the Zeeman effect, which is the splitting of spectral lines in a magnetic field.

- **Option 3:** "Bohr's theory failed for the helium atom."
- This statement is also **true**. Bohr's model is primarily applicable to hydrogen and hydrogen-like ions, and it does not accurately describe multi-electron systems like helium.

- **Option 4:** "Bohr's theory did not give information about energy levels."
- This statement is **false**. Bohr's model does provide information about energy levels, specifically quantized energy levels for electrons in an atom.

### Step 3: Identify the Correct Answer
Since we are looking for the option that is **not** a shortcoming of Bohr's model, we find that:

- **Option 4** is the correct answer because Bohr's model does provide information about energy levels, making it not a shortcoming.

### Final Answer
Thus, the answer is **Option 4**.

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