How can elecromagnetic waves be used in medicine?

What is the density of a block of marble that occupies 310cm3 and has a mass of 853g? Is the voltage the same throughout all points in a series circuit? How many 100 grams to ml? How light intensity controlled? What is the media motion of a surface wave? Why does a light switch turn on your lights? How is the force affected between charges when the distance between them greater? What are the energy transformations of a fluorescent light bulb? Does calving occur slowly or quickly? Do you think that using a sneaker with a small amount of mass in it is a fair test of the friction of the sneakers? What is the difference between scalars and vectors using displacement and distance? What are some common compression algorithms? When did the lituya bay wave happen? How would the photograph look if each balloon were given the opposite to the charge it has now? How many neutrons are found in argon? Which waves can a human not detect? How does the energy that the battery gives to each coulomb of charge compare to the energy that this charge gives to the load? What is holding people back from using solar energy more? How does the pressure of a liquid depend on its depth? Is light bending going through a prism an example of a reflection?

How can elecromagnetic waves be used in medicine?