What is common to all light sources, including incandescent, fluorescent, neon, halogen, laser, and sodium-vapor devices?

Question

abhisar · Answer

All are artificial light sources

anonymous · Answer

Taank you :)

abhisar · Answer

Anytime !

anonymous · Answer

Can you help with 1 more ? 
the question is : 

Both gamma rays and X-rays are used to see inside the body. Which one is used to make images of bones? How are the other rays used?
i have the 1st party which is x rays but need help with other half ..

anonymous · Answer

*part

abhisar · Answer

I dont think gamma rays have any medical use

abhisar · Answer

They are highly mutagenic and may be used to study mutations

anonymous · Answer

Ohh Okaay Thanks For the help and your quick responding 
- Very Much Appreciated