Pick out the longest wavelength from the following types of radiations.
Pick out the longest wavelength from the following types of radiations.
Visible blue light
Ultraviolet light
X-rays
Visible red light
Solution
Ultraviolet light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than \(\mathrm{X}\)-rays.
\(\therefore \quad \lambda_{\text {red }} > \lambda_{\text {blue }} > \lambda_{\mathrm{UV}} > \lambda_{\mathrm{X} \text {-ray }}\)
Hence, visible red light has longest wavelength.