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Form 4 KCSE Physics revision questions and answers on X-rays with video explanations
Form 4 KCSE Physics revision questions and answers on X-rays with video explanations
Total of
20
Lessons
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1.
Name the metal used to shield X-rays operators from the radiation. Give a reason why it is used.(
1:26
)
2.
State one industrial use of Xrays.(
3:16
)
3.
State the energy transformation when fast moving electrons are suddenly stopped by a target in an X-ray tube.(
2:49
)
4.
State and explain the effect of increasing the E.H.T in an X-ray tube on the X-rays produced.(
1:35
)
5.
State the factor that determines the hardness of the X-rays produced in an X-ray tube.(
4:19
)
6.
State the property of X-rays, which makes it possible to detect cracks in bones.(
0:32
)
7.
Give a reason why the target in an X-ray tube is made of tungsten or molybdenum.(
2:24
)
8.
State one difference between hard and soft X-rays.(
2:03
)
9.
The target of X-ray tube is made of metals of high melting point. Give a reason for this.(
1:25
)
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.(
1:29
)
11.
The accelerating of a certain X-ray tube is increased. State the change observed on the X-rays produced.(
2:56
)
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.(
10:11
)
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.(
3:48
)
14.
An X-ray tube produces soft x-rays. State the adjustments that may be made so that the tube produces hard X-rays.(
1:38
)
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.(
5:18
)
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(
3:23
)
17.
The anode of an X-ray tube becomes hot when the tube is in use. State the reason for this.(
1:49
)
18.
State how the intensity of Xrays in an X-ray tube can be increased.(
2:38
)
19.
What are the properties of x-rays?(
4:11
)
20.
What are the dangers of x-rays(
0:52
)
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