A: bohr's orbits are also called stationary states
R : Electrons are stationary in an orbit .

Options

A. IF both assertion & reason are true and the reason is the correct explanation of the assertion then mark
B. IF both assertion & reason are true but the reason is not the correct explanation of the assertion , then mark
C. IF assertion is true statement but reason is false , then mark
D. If both assertion and reason are false statements then mark

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Bohr's orbits are also called stationary states."
- According to Bohr's model of the atom, electrons can occupy certain fixed orbits around the nucleus, and these orbits are indeed referred to as stationary states. This is because, in these states, the electrons do not radiate energy and remain in a stable configuration.

**Hint**: Recall the definition of stationary states in Bohr's model.

2. **Understanding the Reason**:
- The reason states that "Electrons are stationary in an orbit."
- This statement is misleading. While Bohr's orbits are called stationary states, it does not mean that the electrons are stationary in the sense of being at rest. Instead, they are in constant motion along their orbits. The term "stationary" refers to the stability of the energy levels, not the motion of the electrons.

**Hint**: Consider the motion of electrons in classical physics versus quantum mechanics.

3. **Evaluating the Truth of Each Statement**:
- The assertion is true: Bohr's orbits are indeed called stationary states.
- The reason is false: Electrons are not stationary; they are in constant motion within their orbits.

**Hint**: Think about the implications of energy levels and electron motion in atomic theory.

4. **Conclusion**:
- Since the assertion is true and the reason is false, the correct answer is that the assertion is true, but the reason is false.

**Final Answer**: The answer will be (C): Assertion is true, Reason is false.

### Summary:
- Assertion: True (Bohr's orbits are stationary states).
- Reason: False (Electrons are not stationary; they are in motion).