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6. A satellite in a geo-stationary orbit around Earth takes how long for one orbit?
- 75 hours
- 24 hours
- 3 hours
- 30 minutes
7. Why does light refract when it enters glass?
- It decreases in speed
- It increases in speed
8. The highest frequency of sound humans can hear is in the range of...
- 2-20000 Hz
- 2-20 Hz
- 20-20000 Hz
- 20-2000 Hz
- 20-200 Hz
9. Amplitude affects the loudness of sound
10. To increase the potential difference of electromagnetic induction, you should...
- decrease the speed of movement of the magnet
- increase the stregth of the magnetic field
- decrease the number of turns of the coil
- increase the size of the magnet
11. In the UK, the P.D. of mains elctricity is what?
12. Stars create atoms heavier than hyrogen by the process of what?
- Nuclear Fusion
- Nuclear Fission
13. How are atoms heavier than iron formed?
- Radioactive decay of other elements
- In the explosion of supernovae
- In the above process in stars