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Form 4 Physics X-Rays Questions and Answers
Give a reason why the target in an X-ray tube is made of tungsten or molybdenum.
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1.
Name the metal used to shield X-rays operators from the radiation. Give a reason why it is used.
2.
State one industrial use of X-rays.
3.
State the energy transformation when fast moving electrons are suddenly stopped by a target in an X-ray tube.
4.
State and explain the effect of increasing the E.H.T in an X-ray tube on the X-rays produced.
5.
State the factor that determines the hardness of the X-rays produced in an X-ray tube.
6.
State the property of X-rays, which makes it possible to detect cracks in bones.
7.
Give a reason why the target in an X-ray tube is made of tungsten or molybdenum.
8.
The target of X-ray tube is made of metals of high melting point. Give a reason for this.
9.
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.
10.
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.
11.
An X-ray tube produces soft x-rays. State the adjustments that may be made so that the tube produces hard X-rays.
12.
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.
13.
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
14.
The anode of an X-ray tube becomes hot when the tube is in use. State the reason for this.
15.
State how the intensity of X-rays in an X-ray tube can be increased.
16.
State one difference between hard and soft X-rays.
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