A : Wave nature of particles is not visible in daily life.
R : In daliy life , mass of perticles is very high so their de Broglie wavelength is very small.

Options

A. If both Assertion & Reason are ture and the reason is the correct explanation of the assertion , then mark (1) .
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion , then mark (2) .
C. If Assertion is true statement but Reason is false , then mark (3)
D. If both Assertion and Reason are false statements , then mark (4) .

Answer

To solve the problem, we need to analyze the two statements given: Assertion (A) and Reason (R).

### Step-by-Step Solution:

1. **Understanding Assertion (A)**:
- The assertion states that "Wave nature of particles is not visible in daily life."
- This statement is correct because, in our everyday experiences, we do not observe the wave-like behavior of particles. Wave nature is typically observed in controlled experiments at the quantum level.

2. **Understanding Reason (R)**:
- The reason states that "In daily life, the mass of particles is very high so their de Broglie wavelength is very small."
- This statement is also correct. The de Broglie wavelength (λ) is given by the formula:
\[ \lambda = \frac{h}{mv} \]
where \(h\) is Planck's constant, \(m\) is the mass of the particle, and \(v\) is its velocity. In daily life, particles (like a baseball or a car) have relatively high mass and even moderate velocities, leading to a very small de Broglie wavelength, often on the order of \(10^{-30}\) meters, which is undetectable by the human eye.

3. **Checking if R explains A**:
- Since R provides a valid explanation for A, we can conclude that the reason is indeed explaining the assertion. The small de Broglie wavelength due to high mass is the reason why we do not observe wave nature in our daily life.

4. **Conclusion**:
- Both statements A and R are correct, and R correctly explains A. Therefore, the correct answer is that both A and R are true, and R is the correct explanation for A.

### Final Answer:
Both Assertion (A) and Reason (R) are correct, and R explains A.

---