Electromagnetic Radiation Properties · CAP 1999 #A24
Physics
Problem
Consider the following types of electromagnetic radiation: radio waves, infra-red, visible light. Which of the following statements are true?
(i) only radio waves can be used to transmit audio information.
(ii) only infra-red radiation is emitted by very hot objects.
(iii) only visible light can be detected by humans.
(a) only i is true.
(b) only ii is true.
(c) only iii is true.
(d) None of the statements are true.