Chapter # 2 Flashcards
To Remember History, Dates and Important Terms in Chapter # 2
Who first experimented with Discharge Tube?
William Crooks
When was first DT experiment done?
Late 19th Century (William Crooks)
Which gas was used first?
Air
What is the minimum voltage required to ionize (conduct) electricity through air?
5000V - 10000V
At which presure, air (any gas) conducts Electricity(ionizes)?
0.1 mmHg
What happened at pressure of 0.01 mmHg during DTE?
The Tube became dark and no flashes could be seen.
Who named Cathode Rays?
Goldstien
Who discovered charge to mass ration e/m ratio?
J J Thomson
When was e/m discovered?
1897 (J.J.Thomson)
e/m =
E/B^2r
E/B^2r =
e/m
e/m of electron =
1.7588 x 10^11 C/kg
According to Planck’s Theory: Energy travels in
Quantized Packets
According to Plank, Energy is emitted or absorbed
in a dis-continuous manner.
h =
.622 x 10^-34
