Bohr's model of atom is not in agrement with

Options

A. Line spectra hydrogen atom
B. Pauli's principle
C. Plank's theory
D. Heisenberg's principle

Answer

To determine which aspect Bohr's model of the atom is not in agreement with, let's analyze the options systematically.

### Step-by-Step Solution:

1. **Understanding Bohr's Model**:
Bohr's model describes the atom as having electrons in fixed orbits around the nucleus, with specific energy levels. This model successfully explains the line spectra of hydrogen and hydrogen-like atoms.

2. **Line Spectra of Hydrogen**:
Bohr's model can explain the line spectra of hydrogen. It does this by proposing that electrons can transition between these fixed energy levels, emitting or absorbing photons corresponding to the energy difference between these levels. Thus, this aspect is in agreement with Bohr's model.

3. **Pauli's Exclusion Principle**:
The Pauli Exclusion Principle states that no two electrons can have the same set of quantum numbers. While Bohr's model does not explicitly incorporate quantum numbers in the same way as modern quantum mechanics, it does not contradict the principle. Therefore, this aspect is also in agreement.

4. **Heisenberg Uncertainty Principle**:
The Heisenberg Uncertainty Principle states that it is impossible to know both the exact position and momentum of an electron simultaneously. Bohr's model, however, assumes that we can precisely define the electron's orbit and velocity, which contradicts the uncertainty principle. Therefore, this is the aspect that is not in agreement with Bohr's model.

5. **Conclusion**:
Based on the analysis, the correct answer is that Bohr's model is not in agreement with the Heisenberg Uncertainty Principle.

### Final Answer:
Bohr's model of the atom is not in agreement with the Heisenberg Uncertainty Principle.

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