Question

The typical mid-IR region lies between

• A. \(200\!-\!400\ \text{nm}\)
• B. \(400\!-\!700\ \text{nm}\)
• C. \(2.5\!-\!25\ \mu\text{m}\)
• D. \(0.01\!-\!1\ \text{\AA}\)

Hint:

The infrared spectrum is commonly divided as \[ \boxed{ \begin{aligned} \text{Near IR} &:0.78-2.5\ \mu\text{m} \text{Mid IR} &:2.5-25\ \mu\text{m} \text{Far IR} &:25-1000\ \mu\text{m} \end{aligned} } \]

Answer 1

The Correct Option is C

Step 1: Recall the infrared spectrum. The infrared (IR) region is divided into: \[ \begin{aligned} \text{Near IR} &:\;0.78-2.5\ \mu\text{m}, \text{Mid IR} &:\;2.5-25\ \mu\text{m}, \text{Far IR} &:\;25-1000\ \mu\text{m}. \end{aligned} \]

Step 2: Identify the mid-IR range. Hence, the typical mid-IR region is \[ \boxed{2.5-25\ \mu\text{m}.} \] Therefore, \[ \boxed{(C)} \] is the correct answer.