Assertion : All microsopic bodies in motion have wave character.
Reason : Microscopic bodies have very large mass.

Options

A. Assertion and reason both are correct statements and reason is correct explanation for assertion.
B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C. Assertion is correct statement but reason is wrong statement.
D. Assertion is wrong statement but reason is correct statement.

Answer

To solve the given question, we will analyze both the assertion and the reason provided.

### Step-by-Step Solution:

**Step 1: Analyze the Assertion**
- The assertion states that "All microscopic bodies in motion have wave character."
- According to de Broglie's hypothesis, every moving particle has an associated wavelength (λ), given by the formula:
\[ \lambda = \frac{h}{p} \]
where \( h \) is Planck's constant and \( p \) is the momentum of the particle.

**Hint for Step 1:** Recall the de Broglie wavelength formula and its significance in wave-particle duality.

**Step 2: Understand the Implications of the Assertion**
- Momentum (p) is defined as \( mv \) (mass times velocity).
- For microscopic bodies (like electrons, atoms), the mass (m) is very small.
- If the mass is small and the velocity is not zero, then the momentum will also be small, leading to a larger wavelength (λ).
- Thus, microscopic bodies exhibit wave-like behavior due to their small mass.

**Hint for Step 2:** Consider how mass affects the wavelength and the concept of wave-particle duality.

**Step 3: Analyze the Reason**
- The reason states that "Microscopic bodies have very large mass."
- This statement is incorrect. In fact, microscopic bodies (like atoms and subatomic particles) have very small masses.

**Hint for Step 3:** Compare the mass of microscopic bodies with macroscopic bodies to understand their scale.

**Step 4: Conclusion**
- Since the assertion is correct (microscopic bodies in motion do have wave character) and the reason is incorrect (they do not have large mass), we conclude that:
- The assertion is true.
- The reason is false.

**Final Answer:**
- The correct option is that the assertion is true, but the reason is false.

### Summary:
- Assertion: True
- Reason: False
- Correct Option: Assertion is correct, Reason is incorrect.