Which of the following statement is TRUE of ultraviolet, visible and infra-red rays?
-
A.
they are all electromagnetic waves with the same wavelength -
B.
ultra-violet rays have shorter wavelengths than infra-red rays and produce flourescence -
C.
infrared rays have shorter wavelength than visible light and produce the sensation of heat -
D.
the wavelenghts increase in the sequence: visible, ultra-violet, infra-red