K.C.S.E Physics Q & A - MODEL 2007PP2QN18

K.C.S.E Physics Q & A - MODEL 2007PP2QN18

​(a) Figure 14 shows the features of a cathode ray tube

​(i) Name the parts labeled A and B 
A …………………………………. B…………………………….
(ii) Explain how the electrons are produced in the tube 
(iii) State two functions of the anodes 
(iv) At what part of the cathode ray tube would the time be connected?
(v) Why is a vacuum created in the tube?
(b) The graph in figure 15 was obtained on a cathode ray oscilloscope (CRO) screen when the output of an a.c generator was connected to the input of the CRO. The time- base calibration of the CRO was set at 20 milliseconds per centimeter and the y- gain at 5 volts centimeter.

​(i) Determine the pick voltage of the generator 
(ii) Determine the frequency of the voltage 
On the same grid, redraw the graph for the same voltage when the time base calibration is set at 40 milliseconds per centimeter and y- gain at 10 volts per centimeter. (Show at least one complete cycle)

answers