Bohr's model can explain

Options

A. The sopectrum of hydrogen atom only
B. The sopectrum of an atom or ion containing one electron only
C. The sopectrum of a hydrogen molecule
D. The solar spectrum

Explanation

To solve the question "Bohr's model can explain," we need to analyze the options provided and determine what aspects of atomic structure and spectra Bohr's model is capable of explaining.

### Step-by-Step Solution:

1. **Understanding Bohr's Model**:
- Bohr's model was proposed to explain the behavior of electrons in atoms. It specifically describes how electrons orbit the nucleus in defined paths or "shells."

2. **Limitations of Bohr's Model**:
- One of the key limitations of Bohr's model is that it primarily applies to hydrogen-like atoms (atoms with only one electron). It cannot accurately explain the spectra of multi-electron atoms or ions.

3. **Identifying the Correct Application**:
- Bohr's model can effectively explain the spectral lines of hydrogen and hydrogen-like ions (such as He⁺, Li²⁺, etc.), which have only one electron.

4. **Evaluating the Options**:
- If the options include statements about the spectra of hydrogen or hydrogen-like ions, those would be correct. However, if any option suggests that Bohr's model can explain multi-electron atoms or complex spectra, that would be incorrect.

5. **Conclusion**:
- Therefore, the correct answer to the question "Bohr's model can explain" is that it can explain the spectral lines of hydrogen and hydrogen-like ions, but not those of multi-electron atoms.

### Final Answer:
Bohr's model can explain the spectral lines of hydrogen and hydrogen-like ions (single-electron species).