PHYSICS

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Across
  1. 4. The distinctive sound that an instrument makes is called _______
  2. 6. She uses a microphone connected to an _________ to make her voice louder.
  3. 7. If the _____ is high then the frequency is high
  4. 8. sound that the frequency is higher than 20.000 Hz or outside the audible range is called?
  5. 10. Dolphin used _________
Down
  1. 1. You can work out how far sound has travelled by __________ the time and the speed.
  2. 2. As people get older their _______ changes
  3. 3. _______ is very-high frequency that it can be used to make an image of fetus
  4. 5. We use ________ to find the distance to object.
  5. 9. an underwater loudspeaker in a ship is called?