Know It All Friday - 8th Science - 11/6/20

The distance between 2 corresponding parts of a wave  (example- crest to crest) is its _____________________

• trough
• frequency
• amplitude
• wavelength

In what type of wave does the medium vibrate parallel to the direction of the wave?

• surface wave
• longitudinal wave
• transverse wave
• electromagnetic wave

In longitudinal waves, the parts where the coils are spread apart are called what?

• rarefactions
• compressions
• mechanicals
• longitudes

What number represents the amplitude?

• 1
• 2
• 3
• 4

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This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.
• Use a smaller battery.
• Reverse the poles of the magnet.
• Remove all the coils and the nail.

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What is most likely to happen when the switch is closed?

• A magnetic field should be produced
• The nail will rust
• The battery will explode
• The wire will catch on fire

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An electromagnet is a magnet that

• its strength can be varied and turned on and off

• always has a magnetic field around it

• has very little strength

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  Which objects could you combine to build an electromagnet?

• A.  Copper wire, source of electric current, steel screw
• B.  Battery, generator, steel screw
• C. Compass, source of electric current, copper wire
• D..  Battery, lightbulb, plastic straw

True or False: All metals stick to magnets.

• True
• False

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Magnets can harm which of the following:

• books
• computers
• trumpets
• pencils

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