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Magnet and Sound
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Which does cause sound? How does sound travel?
Vibration causes sound. Sound travels though sound waves.
Draw the magnetic field lines with their direction to describe the difference between magnetic fields of a bar magnet and a U-shaped (horseshoe) magnet.
A magnet is an object that produces a magnetic field. True or false?
True
Is the upper side of the compass South, North, East, or West?
North
If the north pole is placed with the north pole of another magnet, they will repel. True or false?
True
Compare the speed of sound in vacuum, solid, liquid, and gas.
Vacuum (=0) < Gas < Liquid < Solid
Which medium is glass? Why? (A/B/C/D)
D
Magnets can attract iron nail. True or false?
True
Name 2 kinds of noise pollution and give examples for each kind.
Natural and artificial noise pollution.
The compass needle is free to turn to point north-south because ______
the Earth has a magnetic field.
How is the Earth similar to a magnet?
Both have North and South Poles; both have magnetic field
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