par peter hill Il y a 14 années
397
Plus de détails
outline the methods used by the Braggs to determine crystal structure
•outline the role of:
◦electrodes in the electron gun
◦the deflection plates or coils
◦the fluorescent screen
in the cathode ray tube of conventional TV displays and oscilloscopes
Makes light when hit with electrons
Colour TV has clusters of three phosphors for observation at a distance
CrO
Single colour green or blue to read at close distance
Old Televisions
External Coils, Cheaper but designed to "RASTER"
Internal E field Plates, Expensive, but highly sensitive for science
Old Television
Three guns for three colours, and designed to switch current pixel to pixel
CRO
Single gun, with focus designed for steady intensity.
F = Eq...........................................(1)
F =qvB..........................................(2)
F=mv^2/r (with no electric field).......(3)
also E= V/d
(1) = (2) gives v
(2) = (3) + v + r measured gives e/m
or (1) = (2) = (3) gives q/m = E/rB^2