Question

Which of the following is the infrared wavelength?

• A. $10^{-4}cm$
• B. $10^{-5}cm$
• C. $10^{-6}cm$
• D. $10^{-7}cm$

Answer 1

Answer: (A)

The wavelength of infrared region is $8\times 10^{-5}cm$ to $3\times 10^{-3}cm$.
So maximum wavelength of infrared region $=8\times 10^{-5}cm\approx 10^{-4}cm$.