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6. how long does it take a geostationary satellite to orbit the earth once?
7. true or false: the angle of incidence=angle or reflection
8. which type of mirror is shiny on the outside?
9. where is the centre of curvature and focal point in a concave mirror?
10. what is the formula for magnification?
- magnification= image height x object height
- magnification= image height/object height
- magnification= image height - object height
11. true or false: sound waves can reflect and refract...
12. what is the range of sounds that we can hear?
- 30 Hz - 30000 Hz
- 20 Hz - 20000 Hz
- 10 Hz- 10000 Hz
13. what happens to the loudness of a noise when the amplitude increases?
- it increases
- it decreases
- it stays the same
14. true or false: the higher the frequency, the lower the pitch?
15. what do we call sound that has a higher frequency than we can hear?
- oscillating waves
- ultrasound
- vibrations
- silence
16. where is ultra sound used?
- all of the above
- baby scans
- cleaning
- quality control
17. which is the correct definition for a magnetic field?
- a magnetic field is the area around a magnet
- a magnetic field is the area around a magnetic material and experience a force acting on it
- a magnetic field is a region where magnetic materials are attracted to one another
18. what is a solenoid?
- a coil of wire
- a type of battery
- a device which makes objects magnetic
19. what name is given to a solenoid with a magnetically 'soft' iron core in the middle?
- an electromagnet
- a magnet
- a battery
20. which of the following factor speeds up an electric motor?
- more turns on the coil
- a soft iron core in the coil
- all of the above
- a stronger magnetic field
- higher current