Which two electromagnetic waves are useful for diagnosing illnesses? x-rays and radio waves microwaves and gamma rays gamma rays and visible light radio waves and ultraviolet waves

radio waves and ultraviolet wave

Explanation:

As we know that electromagnetic waves are of different energy range in which gamma rays are of highest energy and radio waves are of lowest energy.

Now for medical treatment purpose we have to consider the waves of smaller energy as high energy electromagnetic waves are not safe for human body

So here the waves must be of lower energy range

So here it must be

Radio waves and ultraviolet waves

So here radio waves are to find treatment of bones and ultraviolet waves are for the treatment of cancer cells

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

electrical power