X-rays are a kind of electromagnet wave similar to the visible light we see of the radio waves we use to communicate. The difference is the frequency or size of the waves. Radio waves are quite long so they are able to go through most materials, hence why you can listen to the radio even in your basement. Visual light waves are quite short so they bounce off most things instead of going through them, that is why we are able to see that the object is there. X-rays have a wave length in between these two, so they go through soft things such as skin and muscles, but bounce off hard things such as bone. Doctors you a special film, similar to the film we use to that photographs of visual light, to take pictures of the x-ray images which they use to diagnose internal problems such as bone fractures.
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