An X-ray beam is used to produce an image of a model of a thumb. A parallel beam of X-ray radiation of intensity 
is incident on the model, as illustrated in figure I below.
I
Data for the attenuation (absorption) coefficient 
in bone and in soft tissue are shown in figure II below.
II
Calculate, in terms of the incident intensity of the X-ray beam, the intensity of the beam after passing through
a thickness of 
of soft tissue,
the bone and soft tissue, as shown in figure I.
State what is meant by the contrast of an X-ray image.
By reference to your answers in (a), suggest whether the X-ray image of the model has good contrast.
.
.
