K.C.S.E Physics Q & A - MODEL 2013PP2QN017
(a) Figure 9 shows a cathode ray tube in which a beam of electrons is cast on the screen.
​(i) state how the electrons are produced in the tube.
(ii) state how the electron beam is detected. (iii) State the reason for having a variable potential difference (p.d.) at the: (I) grid; (II) anodes. (b) Figure 10 shows the waveform of a signal applied at the y-plates of an oscilloscope whose time-base is switched to the scale of 2 milliseconds per centimeter.
​Determine:
(i) the period of the signal; (ii) the frequency of the signal.
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