How is light energy different from both sound and heat energy? a. light energy can exist independently of matter. b. light is more energetic when its frequency is higher. c. sound energy is a wave. d. heat energy can radiate from an object.

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.