Given that the range of wavelengths of the visible spectrum is \(400 \mathrm{~nm}-700 \mathrm{~nm}\). The wavelength of infra-red ray will be ____________
A. shorter than \(400 \mathrm{~nm}\) B. longer than \(700 \mathrm{~nm} \) C. longer than \(400 \mathrm{~nm}\) but shorter than \(400 \mathrm{~nm}\) D. equal to \(400 \mathrm{~nm}\)
Correct Answer: B
Explanation
\(\frac{\mathrm{R}, \mathrm{L}, \mathrm{V}, \mathrm{U}, \mathrm{X}, \mathrm{G}}{\text { Increasing frequens), decreasing wavelen gth }} \rightarrow\) It can be seen from the above that the wavelength of infra - red ray is longer than that of visible light. Hence, if the wavelength of infra - red ray is from \(400 \mathrm{~nm}\) to \(700 \mathrm{~nm}\), that of infra \(-\) red should be longer than \(700 \mathrm{~nm}\)
