questions? (1 Viewer)

[astroboy]

what gas and gas pressure is used in neon tubes for advertising signs?

why are x-rays produced when electrons collide with heavy atoms?

what material has the highest transition temperature and what is this temperature?

*astroboy*

 

[tieki]

what gas and gas pressure is used in neon tubes for advertising signs?

Taken from http://science.howstuffworks.com/question293.htm :
The idea behind a neon light is simple. Inside the glass tube there is a gas like neon, argon or krypton at low pressure. At both ends of the tube there are metal electrodes. When you apply a high voltage to the electrodes, the neon gas ionizes, and electrons flow through the gas. These electrons excite the neon atoms and cause them to emit light that we can see. Neon emits red light when energized in this way. Other gases emit other colors.

why are x-rays produced when electrons collide with heavy atoms?

No idea, sorry...what module is this in, anyhow?

what material has the highest transition temperature and what is this temperature?

Taken from http://www.sciencenet.org.uk/database/Physics/0003/p01422d.html :
The highest temperature superconductor is a mercury based cuprate with a Tc of about 140K rising to 160K under high pressure.

Hope this helps

 

[ND]

Hmmmm... those questions seem suspiciously similar to the questions on an assessment i have that is due friday. Trying to get someone else to do the work for us are we? It's Chris, right?

edit: saw the "I love subaru" in your profile, definately Chris.