
Medical Imaging OCR A
Quiz
•
Physics
•
12th Grade
•
Easy
Samuel Pullen
Used 3+ times
FREE Resource
15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the process called when radiation is given off by charged particles due to their acceleration?
Radioactive decay
Bremsstrahlung
Nuclear fission
Thermionic emission
Answer explanation
The process of radiation emission by charged particles due to their acceleration is called Bremsstrahlung. This occurs when charged particles, like electrons, are deflected by electric fields, resulting in the release of energy in the form of radiation.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main reason for using a vacuum tube in X-ray production?
To increase the speed of X-rays
To prevent electron collisions with air molecules
To cool the anode
To emit gamma rays
Answer explanation
The main reason for using a vacuum tube in X-ray production is to prevent electron collisions with air molecules, which allows for the efficient generation of X-rays without interference from air.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to X-rays as they ionise matter?
They gain energy
They lose energy
They remain unchanged
They become visible light
Answer explanation
As X-rays ionise matter, they interact with atoms, causing the ejection of electrons. This process results in a loss of energy for the X-rays, making 'They lose energy' the correct choice.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of photons in X-ray production?
They absorb energy
They emit radiation
They have no role
They decrease intensity
Answer explanation
Photons play a crucial role in X-ray production by emitting radiation when high-energy electrons collide with a target material. This emission of radiation is what generates X-rays, making 'They emit radiation' the correct choice.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the unit of intensity (I) for an X-ray beam?
W/m
W/m²
W/m³
W
Answer explanation
The intensity (I) of an X-ray beam is measured in watts per square meter (W/m²), which represents power per unit area. This makes W/m² the correct choice, as it quantifies how much energy is delivered over a specific area.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to a photographic film if it is in the direct path of X-rays?
It becomes transparent
It remains unchanged
It is blackened less
It is blackened more
Answer explanation
Photographic film is sensitive to radiation, including X-rays. When exposed to X-rays, the film's emulsion is affected, leading to increased blackening. Therefore, the correct answer is that it is blackened more.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If the beam intensity halves in 1 cm of bone, what will it be in 3 cm?
One-fourth
One-eighth
One-half
One-sixteenth
Answer explanation
If the intensity halves every 1 cm, after 3 cm it will halve three times: 1/2 (1 cm) -> 1/4 (2 cm) -> 1/8 (3 cm). Thus, the intensity will be one-eighth.
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