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Test# 2

Name: Group:

| |Question text |Criteria |
|Q1 |[pic] | |
| |Where I0 is the initial intensity of photons and [pic] is the linear……………..which describes the fraction of beam of ………rays or | |
| |……….rays that is absorbed. | |
| |The ……………..that results due to interaction between penetrating……….and…………..is not a simple process. There are …….types of | |
| |interactions; 1- |3.1 |
| |Photoelectric occurs when ……………………(briefly discuss) 2- Compton Scattering occurs when……………..(briefly | |
| |discuss) 3- Pair production can occur when……………….(briefly discuss) Sketch a graphs which | |
| |shows all types of the types of interaction a function of energy . | |
| |Draw a schematic diagram which shows the X-ray tube. |3.2 |
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| | |2.1 |
|Q2 |Characteristic X-rays are emitted from heavy elements when their electrons make transition between the………..atomic energy |1.1 |
| |levels. | |
| |Briefly discuss the K and L-alpha X-rays (from electron transition point of views). Draw a schematic diagram showing the | |
| |transition. | |
|Q3 |Correct the following statements if they are false or fill the blank; |2.2 |
| |X-ray was given such name because the discovery of such waves took place in the X-room.[T/F]. | |
| |X-rays is safe on living tissues.[T/F] | |
| |Hard X-ray have short wavelength and can penetrate metals.[T/F]. | |
| |Soft X-rays are used to penetrate ...............in medicine for of broken bones. | |
| |X-rays are produced whenever slow moving electron hit solid.[T/F] | |
| |Intensity of X-rays depends on number of……………per……..hitting the target. | |
| |X-rays travel easily through the skin and muscle while it is reflected by bones. | |
| |The ultraviolet carries more energy than X-rays.[T/F] | |
| |When a frequency of the incident light is greater than the threshold frequency of the material, then all the electrons of that|1.3 |
| |surface would have the same KE regardless the intensity of the light.[T/F] | |
|Q4 |X-rays are widely used and the main fields are industry and medicine. List three uses of the x-rays in each field. Also list |4.1 |
| |some advantages and disadvantages of using x-rays | |
|Q5 |Bremsstrahlung means……….radiation. |1.2 |
| |Accelerated charges give off……….radiation and when the energy of the bombarding electron is high enough, that radiation is in | |
| |the…….region. | |
| |Draw a schematic graph which shows the relative intensity of X-ray continuum radiation. | |