Assertion : A sound source is approaching towards a stationary observer along the tine joining them. Then , apparent frequency to the observer will go on increasing.
Reason : If there is no relative motion between source and observer , apparent frequency is equal to the actual frequency.

Options

A. If both Asseration and Reason are true an dthe Reason is correct explanation of the Asseration.
B. If both Asseration and Reason are true but Reason is not the correct explanation of Asseration.
C. If Asseration is true , but the Reason is false.
D. If Asseration is false but the Reason is true.

Explanation

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

### Step 1: Understand the Assertion
The assertion states that if a sound source is approaching a stationary observer, the apparent frequency to the observer will go on increasing.

- When a sound source moves towards an observer, the sound waves get compressed, leading to an increase in the frequency perceived by the observer. This phenomenon is known as the Doppler effect.

### Step 2: Analyze the Reason
The reason states that if there is no relative motion between the source and the observer, the apparent frequency is equal to the actual frequency.

- When there is no relative motion, the sound waves travel towards the observer without any change in their frequency. Thus, the frequency heard by the observer is the same as the frequency emitted by the source.

### Step 3: Evaluate the Assertion and Reason
- The assertion is true because the frequency does increase as the source approaches the observer.
- The reason is also true because when there is no relative motion, the apparent frequency equals the actual frequency.

### Conclusion
- The assertion is correct, and the reason is also correct. Thus, both statements are true.

### Final Answer
- Assertion: True
- Reason: True