Question

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

Explanation:

X - rays are used in medical imaging (e.g., X - ray radiography) to diagnose bone fractures, lung conditions etc. Radio waves are used in MRI (Magnetic Resonance Imaging) which is a non - invasive diagnostic tool. Microwaves are mainly used for heating (e.g., microwave ovens), gamma rays are used in cancer treatment (radiotherapy) rather than just diagnosis, visible light is not typically used for internal diagnosis in the same way as X - rays and radio waves in medical diagnostics, and ultraviolet waves are harmful in large amounts and not used for internal diagnosis.

Answer:

X - rays and radio waves