Question

By which one of the following an old written material which cannot be read easily, can be read?

• A. $\gamma -rays$
• B. $X-rays$
• C. $IR-rays$
• D. Radio frequency waves

Answer 1

The correct option is C $IR-rays$

IR−rays an old written material which cannot be read easily, can be read

Infrared radiation is a type of electromagnetic radiation, as are radio waves, ultraviolet radiation, X-rays and microwaves. Infrared (IR) light is the part of the EM spectrum that people encounter most in everyday life, although much of it goes unnoticed. It is invisible to human eyes, but people can feel it as heat.Mar 26, 2015