Unit 3 Science Review

A science class wants to make a model of waves. Which sentence describes the best model?

• Drop paper from the top of stairs to see how it moves.

• Roll toy cars down different ramps to see which is the fastest.

• Attach one end of a long rope to a wall, and shake the rope up and down.

• Fill a bathtub with water, and gently place a plastic toy on the surface.

Which statement describes a wave?

• Water moves up and down when it is disturbed.

• Water moves out of a bucket when it is disturbed.

• Water moves in a circle when it goes down a drain.

• Water moves through a pipe when a faucet is turned on.

Which sentence correctly compare Morse and binary codes?

• Morse code is used by cell phones, and binary code is used by computers.

• Morse code and binary code cannot be used to send messages short distances.

• Morse code and binary code use patterns to represent letters in a written message.

• Morse code can only be sent with sound, and binary code can only be sent with electricity.

Which part of the wave is the amplitude?

• a

• b

• c

• d

Which part of the wave is the trough?

• a

• b

• c

• d

Which part of the wave is the crest?

• a

• b

• c

• d

Which part of the wave is the wavelength?

• a

• b

• c

• d

Choose the wave with the shortest wavelength.

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Choose the wave with the longest wavelength.

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