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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?
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?
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