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P4 Radiation for Life

Learn how ultrasound technology is employed in foetal scanning for detailed imaging. Understand the role of different wires in a plug and how a fuse safeguards appliances.

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P4 Radiation for Life

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  1. P4 Radiation for Life 6 mark questions (and mark schemes)

  2. Ultrasound can be used in foetal scanning. A three-dimensional (3-D) scan uses computer technology and gives a more detailed image than a conventional two-dimensional (2-D) scan. Explain how ultrasound is used in foetal scanning and why a pregnant woman is scanned with ultrasound but is never X-rayed.

  3. 6 Mark Question on THE PLUG • Explain the functions of the different wires in the plug AND how a fuse protects the appliance if it develops a fault.

  4. 6 Mark Question on THE PLUG • Live wire carries current to the appliance (1 mark) • Neutral wire completes the circuit and is kept at 0V (1 mark) • Earth wire is a safety feature that ‘earths’ appliances with metal cases (1 mark) • Wire in fuse melts if current gets too large, stopping current (1 mark) • This prevents overheating which may cause fire (1 mark) • Prevents further damage to the appliance(1 mark)

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