Science Unit 1 Assessment WAVES

The two words written in Morse code belong in the following sentence. Use the key to decode the message and complete the sentence.

Morse code can travel as

Michelle and Jasmine used a rope to model waves. When Michelle moved one end of the rope up and down, waves moved down the rope toward Jasmine.

Michelle is about to make another set of waves. Which of these would definitely cause the waves to have a shorter wavelength than the first set of waves?

• 
  if Michelle used a longer rope to make the wave

• if Michelle moved the rope up and down more slowly

• if Michelle used a shorter rope to make the wave

• if Michelle moved the rope up and down more quickly

Every _______ signal is made up of ones and zeroes.

• electronic

• text

• coded

• digitized

The chart below shows a code used for sending messages. The code is called semaphore. Semaphore messages are sent by a person holding two flags. The flags are moved into different positions to mean different things. Another person can see the pattern displayed by the flags and interpret it using the chart below.

Which of the following is a reason for using semaphore?

• Semaphore can be used when the person receiving the signal cannot see the person sending the signal.

• Semaphore can be used where there is a lot of loud noise that might cover up a sound signal.

• Semaphore can be used even when the person sending semaphore messages does not know the semaphore code.

Brandice jumps into a pool. The energy from her hitting the water travels away from her through waves. The waves then reach a beach ball, which is on the other side of the pool.

The beach ball will

• move toward Brandice.

• spin.

• bob up and down.

• sink under the water.

A buoy is floating in the deep ocean. It is not connected to the floor of the ocean. When a wave passes, the buoy moves up and down. It does not move closer to the coast or farther away from it.

Based on how the buoy moves, which of these is true?

• Deep ocean waves cause water to move in the direction of the wave.

• Deep ocean waves cause water to move away from the coast.

• Deep ocean waves cause water to move toward the coast

• Deep ocean waves cause water to move up and down.

Select the correct location on the image.

A diagram representing a wave is shown below. Which letter indicates the wavelength of the wave?

• A

• B

• C

• D

Cross-stitch is a kind of art. The area where the art is made is a grid of little squares. The artist makes a cross-stitch pattern by sewing small crosses in some squares while leaving other squares blank.

Carlita just finished her very first piece of cross-stitching. It is shown below.

Carlita called her best friend, Susan, to tell her about it. Susan wants to make a cross-stitch just like Carlita's, so she asks for a picture of it. The camera on Carlita's phone is broken.

• Carlita could describe to Susan the color that she used and how to make a well-shaped cross.

• Carlita could e-mail Susan a long number for each row with zeroes for blanks and ones for crosses.

• Carlita could tell Susan what the cross-stitch says and how much thread she used.

• Carlita could send Susan a text message that tells her what supplies were used and how much they cost.