Fig. 10.1 shows the basic structure of a cathode-ray oscilloscope (c.r.o.). Electrons strike the middle of the screen and a bright spot is produced.

1. (a)(i)On Fig. 10.1, write the names of parts B, D, E and F in the spaces provided.[3]
2. (a)(ii)1.State the purpose of 1. part B,[1]
3. (a)(ii)2.2. part D.[1]
4. (a)(iii)State the useful energy change that occurs as electrons hit the screen of the c.r.o.[1]
5. (a)(iv)Describe what happens inside the c.r.o. to turn the spot into a horizontal line.[2]
6. (b)(i)1.Determine 1. the maximum voltage,[1]
7. (b)(i)2.2. the time for one oscillation,[2]
8. (b)(i)3.3. the frequency of the sound wave.[2]
9. (b)(ii)The settings of the c.r.o. remain the same. On Fig. 10.2, sketch the trace of a sound wave with a smaller amplitude and a lower frequency.[2]

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