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6. A light ray bends towards the normal when travelling from air to glass?

  • True
  • False

7. What image is created in a converging lens for an object between the principle focus and the lense?

  • Virtual image
  • Real image

8. What image is created in a converging lens for an object beyond the principle focus?

  • real image
  • Virtual image

9. What image is created in a diverging lens?

  • Virtual image
  • Real image

10. Sound waves can travel through a vacuum?

  • False
  • True

11. What is an echo?

  • The refraction of sound
  • The reflection of sound
  • The frequency of sound

12. What does increasing the loudness of a sound do to the wave?

  • Increase the amplitude
  • Decrease the amplitude
  • Increase the frequency
  • Decrease the frequency

13. What does increasing the pitch of a sound do to the wave?

  • Increase the amplitude
  • Increase the frequency
  • Decrease the frequency
  • Decrease the amplitude

14. What is the range of human hearing?

  • 10-10,000 Hz
  • 20-20,000 Hz
  • 200-20,000 Hz

15. What is ultra sound?

  • sound above the range of human hearing
  • sound below the range of human hearing
  • sound in the range of human hearing