Question

Pick up the wavelength ranges associated with UV spectroscopy.

• A. 0.8 - 500 µm
• B. 400 - 100 nm
• C. 380 - 750 nm
• D. 0.01 - 10 nm

Hint:

Wavelength and frequency are inversely related (\( c = \nu \lambda \)). UV radiation has higher energy than visible light because its wavelength is shorter.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
The electromagnetic spectrum ranges from very short gamma rays to very long radio waves.
Ultraviolet (UV) radiation lies between X-rays and visible light.

Step 2: Detailed Explanation:
Visible light ranges approximately from 380 nm to 750 nm (Statement 3).
Radiation just beyond the violet end of visible light is termed Ultraviolet.
The UV region is generally defined as ranging from 100 nm to 400 nm (Statement 2).
It is further subdivided into:
- UV-A: 315 - 400 nm
- UV-B: 280 - 315 nm
- UV-C: 100 - 280 nm
Statement 1 (0.8 - 500 µm) refers to the Infrared and Microwave regions.
Statement 4 (0.01 - 10 nm) refers to the X-ray region.
UV spectroscopy is a technique used in chemistry to study electronic transitions in molecules, particularly those with double bonds or lone pairs.

Step 3: Final Answer:
The standard wavelength range for ultraviolet radiation is 400 nm to 100 nm.