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## NASA

### Course: NASA>Unit 2

Lesson 4: Spectroscopy

# Gamma waves (1900)

Created by NASA.

## Want to join the conversation?

• How can we be sure that there is no other radiation beyond the know electromagnetic spectrum?
• They are Identified as specific types; they just aren't on earth, and we don't really know how to use them, so they don't appear on most American spectrums. They showed them in our German foreign exchange student's school book. They are called cosmic rays.
• How were Gamma waves discovered :D
• Paul Villard, a French chemist and physicist, discovered gamma radiation in 1900, while studying radiation emitted from radium. Villard's radiation was named "gamma rays" by Ernest Rutherford in 1903.
Source: http://en.wikipedia.org/wiki/Gamma_ray#History_of_discovery
• - Wait ... so we can see into the past??
"When the universe was just 630 million years old"
• yes, because light takes time to travel. prtend you have something 10 light years away, then when you see it, it is 10 years before present because it took light 10 yeas to reach your eyes. the sun is 8 light minutes away, so the light you are seeing from the sun is 8 miutes before.
Hoped this helped.
• Is there anything in the spectrum greater than Gamma rays?
• Ultra-high-energy gamma rays are gamma rays with photon energies higher than 100 TeV (0.1 PeV). They have a frequency higher than 2.42 × 1028 Hz and a wavelength shorter than 1.24 × 10−20 m. As of 2014, they are theoretical only and have not been detected.
(1 vote)
• How fast do gamma waves travel?
• All electromagnetic waves travel at speed of light i.e. 3x10^8 m/s in vacuum.Gamma rays are no exception to these.
• At , why does that look so similar to an iPhone? haha
• Because it is supposed to be a phone
(1 vote)
• How can we be sure that there is no other radiation beyond the know electromagnetic
spectrum?
• We can't. But if we can't detect it, and it doesn't interact with anything to be able to detect, then it may as well not exist. If it interacted with something, we would have a way to detect it and learn about it.
• how do gamma rays effect the human body
(1 vote)
• as you know our DNA is made up of atoms. gamma rays are ionizing. when it passes through our DNA it ionizes it (ionization is the process in which an atom losses its electron) because of which the DNA losses its pattern ( in the DNA a group of atoms define something that makes protein accordingly because of which our organs function example the binary code the pattern decides the software ). Which makes it produce wrong types of proteins which ultimately results in the death of the person (if its in high dozes).