Chapter U5.115, Problem 1TAI

Interpretation Introduction

Interpretation:

The evidence of light waves that are not visible to human eye needs to be mentioned.

Concept introduction:

The visible region in the electromagnetic spectrum possesses lights having wavelength $\text{7}\times {\text{10}}^{-7}\text{- 4}\times {\text{10}}^{-7}\text{m}$, in this region the light can be detected by human eye.

Other waves which are in the electromagnetic spectrum that cannot be detected by human eye are:

UV (ultra violet) −light, IR (infrared), X-rays, radio waves etc.

Explanation of Solution

Evidence for light rays that are not in the visible spectrum with examples:

• During hot summer day, sun burns on the skin are due to UV-light in the sun rays.
• Though radio waves are not visible, one can enjoy music from FM radio.
• Though X-rays are not in the visible region of light, still when they are passed through cracked bones or teeth with cavity, their images can be detected with their help.
• IR rays are used in the detection of functional groups in the unknown molecules in organic chemistry.