Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. (HT and Physics Only) How can objects in deep water be detected?
   • (HT and Physics Only) Echo sounding, using high frequency sound waves is used to detect objects in deep water and measure water depth.
2. (Physics only) How do sound waves travel?
   • Sound waves can travel through solids causing vibrations in the solid.
3. (Physics only) What causes the sensation of sound?
   • Within the ear, sound waves cause the ear drum and other parts to vibrate which causes the sensation of sound.
4. (Physics only) What restricts the limits of human hearing?
   • The conversion of sound waves to vibrations of solids works over a limited frequency range.
5. (Physics only) What causes wave disturbances between sound waves and vibrations in solids?
   • Examples may include the effect of sound waves on the ear drum.
6. (Physics only)
7. (Physics only) What is the normal range of human hearing?
   • The range of normal human hearing is from 20 Hz to 20 kHz.