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.
Washington State Learning 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.
Question 1
Sending a picture over the internet turns it into…
- a rock
- a sound only
- a digital code
- water waves
a digital code
Hint: Numbers that can be sent.
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
up and down
Hint: Waves carry energy, not the water.
Question 3
A loud sound has a wave with…
- no amplitude
- no energy
- a big amplitude
- a tiny amplitude
a big amplitude
Hint: Taller waves are louder.
Question 4
Braille uses patterns of…
- sounds
- colors
- smells
- raised dots
raised dots
Hint: Read with fingertips.
Question 5
A barcode is a pattern of…
- lines
- sounds
- tastes
- smells
lines
Hint: Scanners read the lines.
Question 6
A phone sends a voice call by changing sound into…
- light from a candle
- smoke
- water waves
- electrical and radio signals
electrical and radio signals
Hint: Signals carry the pattern.