Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. (HT only) How are radio waves produced?
   • (HT only) Radio waves are produced by oscillations in electrical circuits.
2. How can electromagnetic waves be generated?
   • Changes in atoms and the nuclei of atoms can result in electromagnetic waves being generated
3. What types of waves are hazardous on human body tissue.
   • X-rays and gamma rays can have hazardous effects on human body tissue.
4. How are gamma rays generated?
   • Gamma rays are emitted from the nucleus. They have no charge or mass.
5. What effects can Ultraviolet waves cause to the skin?
   • Ultraviolet waves can cause skin to age prematurely and increase the risk of skin cancer.
6. What are three ways that show energy is transferred by electromagnetic waves?
   • Some examples of how electromagnetic waves transfer Energy are: Radio waves - radios in communication Microwaves - ovens for heating food Infrared radiation - wireless remote controls Ultraviolet - Ultrasound scans Visible light - heat and light from light bulb X-Ray: Energy passes through tissue but stopped by bone in X ray imaging Gamma: Energy used to kill pathogens during sterilisation of medical equipment
7. What effects the outcome of being exposed to radiation?
   • The type of radiation and the size of the dose.
8. What are the risks and consequences of exposure to radiation?
   • The risks of exposure to radiation can include radiation poisoning and cancer.
9. What type of electromagnetic waves are ionising?
   • X-rays and gamma rays are ionising radiation that can cause the mutation of genes and cancer.
10. (HT only) What type of current is produced when radiowaves are absorbed?
    • (HT only) When radio waves are absorbed they may create an alternating current.
11. (HT only) How can the wavelength of electromagnetic waves be varied?
    • (HT only) Different substances may absorb, transmit, refract or reflect electromagnetic waves
12. What units is radiation measured in?
    • Radiation dose is measured in sieverts
13. How many millisieverts are there in 1 sievert?
    • 1000 millisieverts (mSv) = 1 sievert (Sv)
14. (HT only) Why is each type of electromagnetic wave suitable for practical application?
    • Each member of the electromagnetic wave is suitable for a practical application because it has a small range of frequency and wave length.