GCSE Physics (AQA)

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Protecting from EM Waves

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Waves Electromagnetic waves

Protecting from EM Waves

5:04 Radio Waves and Hazardous Waves
Spec 4.6.2.3
Previous Hazards from EM Waves Next Applications of Low-Frequency EM Waves
  • Exposure to harmful electromagnetic waves increases the risk of damage.
  • High frequency waves like X-rays and gamma rays can ionize cells and cause cancer.
  • Ultraviolet waves can cause sunburns or skin cancer.
  • Risk of cancer increases with higher exposure to these waves.
  • Precautions against ultraviolet waves include using sun cream, wearing a sunhat, sunglasses, staying in the shade, or limiting time outside.
  • Exposure to X-rays and gamma rays is measured as radiation dose.
  • Radiation dose is measured in verts or sv, but this unit is not required for exams.
  • Common exposure to gamma waves includes eating bananas, which emit a small dose.
  • Background radiation contributes to yearly exposure, averaging around two milli verts.
  • X-ray scans expose individuals to X-rays, but the dose is less than yearly background radiation exposure.
  • Concern about radiation dose is necessary when exposed to stronger sources for extended periods.
  • X-rays and gamma rays are used in medical procedures, such as imaging bones and cancer treatment.
  • Steps are taken to reduce radiation dose in medical procedures, like limiting the number of X-ray photos.
  • Doctors track the number of procedures to manage cumulative radiation exposure.
  • Medical staff operate equipment remotely to minimize their exposure.
  • Shielding is used to protect staff from radiation.
  • Suitable ways to reduce radiation exposure may be required in exams.

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