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4th grade · Science · Unit 7 of 10

Waves & Codes

Waves, amplitude, wavelength and sending patterns.

What your child practices

Practices how waves have amplitude and wavelength and can make objects move, and how patterns like codes, flashes and digital signals carry information.

California Content Standards learning standard: 4-PS4-1; 4-PS4-3 · patterns in waves, and using patterns to transfer information

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Sending a picture over the internet turns it into…

    • a rock
    • a sound only
    • a digital code
    • water waves

  2. Question 2

    A floating duck bobs up and down as waves pass. The water mostly moves…

    • up and down
    • to shore with the wave
    • in a straight line away
    • nowhere

  3. Question 3

    A loud sound has a wave with…

    • no amplitude
    • no energy
    • a big amplitude
    • a tiny amplitude

  4. Question 4

    Braille uses patterns of…

    • sounds
    • colors
    • smells
    • raised dots

  5. Question 5

    A barcode is a pattern of…

    • lines
    • sounds
    • tastes
    • smells

  6. Question 6

    A phone sends a voice call by changing sound into…

    • light from a candle
    • smoke
    • water waves
    • electrical and radio signals

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