Sir William Hershel Passed a Beam of Sunlight Through a Prism

Multiple Choice

Sir William Hershel passed a beam of sunlight through a prism and held a thermometer just beyond the end of the visible spectrum.The thermometer registered a temperature increase,indicating that it was being exposed to an invisible form of energy that is now called

A) radio waves.
B) microwaves.
C) infrared light.
D) ultraviolet light.