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Form 4 KCSE Physics revision questions and answers on X-rays with video explanations

State the energy transformation when fast moving electrons are suddenly stopped by a target in an X-ray tube.

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Explanation/Answer Text:

- Kinetic energy is transformed to heat energy

Questions/Lessons List

1. Name the metal used to shield X-rays operators from the radiation. Give a reason why it is used. ( free video lesson)

2. State one industrial use of Xrays. ( free video lesson)

3. State the energy transformation when fast moving electrons are suddenly stopped by a target in an X-ray tube. ( free video lesson)

4. State and explain the effect of increasing the E.H.T in an X-ray tube on the X-rays produced. ( free video lesson)

5. State the factor that determines the hardness of the X-rays produced in an X-ray tube. ( free video lesson)

6. State the property of X-rays, which makes it possible to detect cracks in bones. ( free video lesson)

7. Give a reason why the target in an X-ray tube is made of tungsten or molybdenum. ( free video lesson)

8. State one difference between hard and soft X-rays. ( free video lesson)

9. The target of X-ray tube is made of metals of high melting point. Give a reason for this. ( free video lesson)

10. State with a reason the effect of the X-rays produced in an X-ray tube, when the p.d across the tube is increased. ( free video lesson)

11. The accelerating of a certain X-ray tube is increased. State the change observed on the X-rays produced. ( free video lesson)

12. a)X-rays are used for detecting cracks inside metal beams i. State the type of the Xrays used ii) Give a reason for your answer in (i) above b)Figure 13 shows the features of an X-ray tube i)Name the parts labelled A and B ii. Explain how a change in potential across PQ changes the intensity of the X-rays produced in the tube. iii) During the operation of the tube, the target becomes very hot. ( free video lesson)

13. In an x-ray tube it is observed that the intensity of X-rays increases when potential difference across the filament is increased. Explain this observation. ( free video lesson)

14. An X-ray tube produces soft x-rays. State the adjustments that may be made so that the tube produces hard X-rays. ( free video lesson)

15. Figure 18 shows parts of an X-ray tube. a) Explain why: i. A potential difference is applied to the filament. ii. A high potential difference is applied between a cathode and the anode iii. Most of the tube is surrounded by lead. b) State how the resulting X-rays are affected by increasing the potential difference between the anode and the cathode. ( free video lesson)

16. Figure 5 shows a narrow beam of X-rays passing between two metal plates in air. The plates are connected in series with a switch, a cell and a milliammeter. It is observed that when the switch is closed a current flows in the milliammeter. Explain this observation ( free video lesson)

17. The anode of an X-ray tube becomes hot when the tube is in use. State the reason for this. ( free video lesson)

18. State how the intensity of Xrays in an X-ray tube can be increased. ( free video lesson)

19. What are the properties of x-rays? ( free video lesson)

20. What are the dangers of x-rays ( free video lesson)

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