Cathode Ray Tube Prac (1 Viewer)

[Dash]

First off... Will we ever be tested on the results of this experiment...
Cos most questions relating to experiments simple ask to outline the method and some variables...

Also, are these results correct?

(specific questions about the results are in bold)

~5% atm. faint purpleish glow (where is the glow?)
~3% purplish streamers (are these streamers the straited positive columns?)
~>1% pinkish striations
>0.05% tube enveloped by crookes dark space, yellowgreenish glow at the end of tube (which end?)

Thanx

 

[ND]

I answered those in that other thread.

 

[Constip8edSkunk]

and yeah i made a mistake, streamer before the glow, thx nd

 

[Dash]

Originally posted by ND
I answered those in that other thread.

I didnt understand what you said, so I was hoping you could explain it here

 

[ND]

Ok which part didn't you understand? First there are streamers, which are lightning-like things (nfi how to explain what they look like) that go between the cathode and anode. Then comes a glow, all the way across the tube from the cathode to anode. Then the glow kinda breaks up into streamers with faraday's dark space near teh cathode. Finally the glow break up further, and only a faint glow near the anode is visible.

 

[Dash]

Ahhh... I found good results on the HSC ONLINE site

* At 5% of atmospheric pressure, long, thin red-purple streamers appear between the two electrodes.

* At lower pressure, these streamers give way to a soft red glow.

* Upon further pressure reduction, the glow is broken into striations, bands of light and dark. The amount of dark space between the glowing bands increases with further reductions.

* At 0.01% of atmospheric pressure, the dark space extends throughout the tube. At this very low pressure, the glass near the anode glows a yellow-green colour.