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6. What is the formula for the Critical Angle?

  • sin C = 1 / n
  • sin C = 1 x n

7. What is the approximate speed of Sound?

  • 330 km/h
  • 330 m/s
  • 3300 m/s
  • 330 km/s

8. What is the unit used for Frequency?

  • m
  • m/s
  • Hz
  • s

9. What is Frequency?

  • The number of waves that travels past a point in one second.
  • The height of the wave from the middle to a peak or trough.
  • The length of one complete wave.
  • The time it takes for one complete wave.

10. What is the formula for the Refractive Index?

  • Refractive Index = sin (i) / sin (r)
  • Refractive Index = sin (r) x sin (i)
  • Refractive Index = sin (r) / sin (i)
  • Refractive Index = sin (i) x sin (r)

11. What is the Period of a wave?

  • The length of one complete wave.
  • The time it takes for one complete wave.
  • The height of the wave from the middle to a peak or trough.
  • The number of waves that travels past a point in one second.

12. Which of these two angles are always equal?

  • Incidence and Reflection
  • Incidence and Refraction
  • Reflection and Refraction

13. What type of wave is sound an example of?

  • Longitudinal
  • Transverse

14. Which of these are uses of Infra-red?

  • Heating and Night-vision Equipment
  • Broadcasting and Communications
  • Sterilizing Food and Medical Equipment
  • Cooking and Satellite Transmissions