K.C.S.E Physics Q & A - MODEL 2001PP2QN04

K.C.S.E Physics Q & A - MODEL 2001PP2QN04

Fig 3 shows the main features of a cathode ray tube (CRT) of a cathode ray oscilloscope (CRO)​

i) Describe how the electrons are produced in the tube.
ii) State and explain the function of the grid.
iii) State what would be observed on the screen if an a.c voltage is connected across the y-plates.
iv) State how the deflection system of a television differs fro that of a CRO.
v) Give the reason why it is possible to have a wider screen in the television set than on the C.R.O.
b) In an excited hydrogen atom. An electron moves from an energy level of -1.36 x 10 ^-19J. Determine the wavelength of the radiation emitted. (Planks constant h= 6.63 x 10^-34 Js and speed of light c= 3.0 x 108 ms^-1).

answers