Physics (AS & A Level) · Oct / Nov 2016 · Paper 42 · Question 5
9702
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Ultrasound may be used to obtain information about internal body structures.
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5(a)[2]
transducer/transmitter can be also be used as the receiver or transducer both transmits and receives receives reflected pulses between the emitted pulses (needs to be pulsed) in order to measure/determine depth(s) (needs to be pulsed) to determine nature of boundaries Any three of the above marking points, 1 mark each [2]
5(b)(i)[2]
product of speed of (ultra)sound and density (of medium) reference to speed of sound in medium [2]
5(b)(ii)[2]
if Z1 and Z2 are (nearly) equal, IT / I0 (nearly) equal to 1/unity/(very) little reflection/mostly transmission if Z1 ≫ Z2 or Z1 ≪ Z2 or the difference between Z1 and Z2 is (very) large, then IT / I0 is small/zero/mostly reflection/little transmission [2]
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