Examples of use
Gamma rays are uses gamma rays are very radioactive and kill cells upon contact. So doctors use them to kill cancerous cells. This is called radiotherapy.
Gamma-Ray burst are bursts of gamma rays from stars millions of miles away. The only reason we have not died from these gamma rays hitting us is because of our atmosphere stopping them. If there was a big one that hit us directly on it would destroy our atmosphere and we would all die by ultraviolet rays from the sun. This video describes it a lot better.
Speed of light 3*10^8 m/s
How gamma rays react In different materials
Air- it can't travel through it for very long
Human flesh- it kills cells be cuase it's extremely radioactive
Water- It will travel threw it
Glass- It can easily pass threw it
The only way to completely stop them is with lead or concrete.