Statement-1 : Ultrasonics is the acoustic analogue of ultraviolet radiation
Statement-2 : Ultraviolet rays do not produce visual sensations while ultrasonic waves are not heards by the human ear.

Options

A. Statement-1 is true, Statement-2 is true , Statement-2 is correct explanation for Statement-4
B. Statement-1 is true,Statement-2 is true , Statement-2 is NOT a correct explanation for Statement-4
C. Statement-1 is true, Statement-2 is false
D. Statement-1 is false, Statement-2 is true

Answer

To analyze the given statements, we will break down the concepts of ultrasonics and ultraviolet radiation, and then evaluate the validity of both statements.

### Step-by-Step Solution:

1. **Understanding Ultrasonics**:
- Ultrasonics refers to sound waves that have frequencies greater than 20 kHz (20,000 Hz).
- These sound waves are not audible to the human ear because the typical range of human hearing is from 20 Hz to 20 kHz.

2. **Understanding Ultraviolet Radiation**:
- Ultraviolet (UV) radiation is part of the electromagnetic spectrum and has frequencies higher than visible light (beyond the violet end of the spectrum).
- Like ultrasonics, ultraviolet rays are not visible to the human eye, as the human eye can only perceive light within the visible spectrum (approximately 400 nm to 700 nm).

3. **Evaluating Statement-1**:
- Statement-1 claims that ultrasonics is the acoustic analogue of ultraviolet radiation.
- This is correct because both ultrasonics and ultraviolet radiation exist outside the range of human perception (auditory and visual, respectively).

4. **Evaluating Statement-2**:
- Statement-2 states that ultraviolet rays do not produce visual sensations while ultrasonic waves are not heard by the human ear.
- This statement is also correct. Ultraviolet rays are indeed not visible, and ultrasonic waves are not audible.

5. **Conclusion**:
- Since both statements are correct and Statement-2 provides a valid explanation for Statement-1, we can conclude that both statements are true and Statement-2 is the correct reason for Statement-1.

### Final Answer:
Both Statement-1 and Statement-2 are true, and Statement-2 is the correct explanation for Statement-1.

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