Fig. 8.1 presents images obtained from two separate medical scanning procedures.
(a(i))[1]
Define ultrasound.
(a(ii))[1]
State how the speed of sound in liquid is different from the speed of sound in air.
(a(iii))[1]
State the speed of X-rays in a vacuum.
(b)[3]
Describe three similarities or differences between the use of ultrasound and X-rays in medical scanning procedures.
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