(a(i))[1]
State, for an X-ray image, what sharpness means.
(a(ii))[1]
State, for an X-ray image, what contrast means.
(b)[3]
A parallel X-ray beam travels through a thickness of $2.3\,\text{cm}$ of soft body tissue. The emerging beam has an intensity equal to $12\%$ of the incident-beam intensity. Calculate the linear attenuation (absorption) coefficient $\mu$ of the soft body tissue. Give a unit with your answer.
(c)[2]
In medical diagnosis, X-rays may be used to produce a single X-ray image or may be used in computed tomography (CT scanning). Suggest an advantage and a disadvantage of CT scanning compared with single X-ray imaging for diagnosis.