Electron Beam

how far does the electron beam fall while traversing this distance?

In a TV set, an electron beam moves with horizontal velocity of 4.5 × 107 m/s across the cathode ray tube and strikes the screen, 48 cm away.
The acceleration of gravity is 9.8 m/s2 .
How far does the electron beam fall while traversing this distance?
Answer in units of m.

first, find the time of travel across the tube:

time = dist/speed = 0.48m/4.5×10^7m/s = 1.1×10^(-8)s

distance fallen = 1/2 gt^2 = 1/2*9.8m/s/s*(1.1×10^(-8)s)^2
dist = 5.6×10^-16m

MAGNETIC DEFLECTION OF AN ELECTRON BEAM