Assertion : Electron revolves around a positvely charged nucleus like a planet revolves around the sun.
Reason : The force acting in both the cases is of same kind.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is the correct explanation of assertion.
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Explanation

To analyze the given assertion and reason, we can break down the problem step by step.

### Step 1: Understand the Assertion
The assertion states that "Electron revolves around a positively charged nucleus like a planet revolves around the sun."
- This is a comparison between the motion of an electron in an atom and the motion of a planet in a solar system.

### Step 2: Identify the Forces Involved
Next, we need to identify the forces acting in both scenarios:
- For the electron revolving around the nucleus, the force responsible is the **electrostatic force** (or Coulomb force) due to the attraction between the negatively charged electron and the positively charged nucleus.
- For a planet revolving around the sun, the force responsible is the **gravitational force** due to the mass of the planet and the mass of the sun.

### Step 3: Compare the Forces
Now, we compare the two forces:
- The electrostatic force acts between charged particles (like electrons and protons).
- The gravitational force acts between masses (like planets and the sun).

### Step 4: Evaluate the Reason
The reason states that "The force acting in both the cases is of the same kind."
- This statement is incorrect because the forces are fundamentally different: one is electrostatic and the other is gravitational.

### Step 5: Conclusion
From the analysis:
- The assertion is true because electrons do revolve around the nucleus in a manner similar to planets around the sun.
- The reason is false because the forces acting in both cases are not of the same kind.

Thus, the final conclusion is:
- **Assertion is true, Reason is false.**

### Final Answer
The correct option is that the assertion is true, but the reason is false.

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