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6. Centripetal force depends on:
- Radius
- Mass
- All of the above
- Speed
7. The force that keeps centripetal force on planets in orbit is:
- Stars
- Centrifugal force
- Gravity
- Pull of sun
8. Geostationary satellites are used for research.
9. Low Polar Satellites are used for:
- Weather and spying.
- Weather and communications.
- Spying and communications
- Research and spying.
10. A virtual image comes from diverging rays which makes the light appear like its come from a different place.
11. Angle of Incidence = angle of ?
12. Refraction of light is when rays change direction as they enter a new medium.
13. Light is refracted when it enters and leaves glass prisms.
14. Magnifying glasses use:
- Concave mirror
- Convex lens
- Concave lens
- Convex mirror
- Plane mirror
15. A image formed on photographic film is:
16. The image is inverted, same as on the retina of our eyes.
17. Sound is made by:
- Silent light rays
- Vibrations
- Noise
18. Humans hear in the range:
- 20-2000Hz
- 20-20 000Hz
- 20-200 Hz
19. Sound travels in a vacuum.
20. Ultrasound is...
- silent waves
- to high pitched for humans
- too long waves