chemistry chapter 2 Flashcards
to remember important points
why electric current flows on low pressure?
A low pressure is required as at high pressure the movement of electron will be retarded due to collision with nucleus / atoms of gas.
what does the creation of the shadow of opaque objects by cathode rays prove?
it proves that the cathode rays travel in a straight line perpendicular to the cathode.
shape of the cathode the rays are emitted from
concave cathode
line spectrum shows
the characteristics of an atom, and is when an element is volatilized on a flame it emits light which when seen under the spectrometer show bright lines separated by dark spaces.
Continuous spectrum shows
in this, no distinct lines are seen as the colours are completely merged. they show the characteristics of material in bulk.
What is the discharge tube experiment?
The discharge tube experiment involves passing electricity through gases at low pressure, which led to the discovery of cathode rays (negatively charged particles) and ultimately electrons.
