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Grade 6 · unit review

Review: Waves, Sound and Light

Compare mechanical and electromagnetic wave behavior.

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Bring the unit skills together

Use these 4 new cases to check your reasoning. Choices are temporary and are not saved to an account, sent to staff or recorded as school grades. Download your current review choices before leaving or reloading.

Unit review questions
1. Which scientific label fits the specifically described step or feature? Supplied case: A rope disturbance.
Need a hint?
  • Look for the described feature: wave requires matter.
  • Compare the given mechanism with the other labels; do not infer unmentioned events.
2. Supplied case 5: complete cycles=90; duration (s)=5, using the explicitly named quantities. Frequency equals complete cycles divided by seconds. What result follows?
Need a hint?
  • Frequency equals complete cycles divided by seconds.
  • Use seconds for hertz.
3. Which interaction describes the specifically named returned, absorbed or passing component? Supplied case: Sound echo returns.
Need a hint?
  • Look for the described feature: wave returns from a boundary.
  • Compare the given mechanism with the other labels; do not infer unmentioned events.
4. Which scientific label fits the specifically described step or feature? Supplied case: Higher cycle rate.
Need a hint?
  • Look for the described feature: cycles per second.
  • Compare the given mechanism with the other labels; do not infer unmentioned events.

The download contains your current choices and any checked feedback. Keep the separate transfer-task work in your own document; downloading its instructions does not mark it complete.

Use the skills in a new task

Create a four-panel explanation for “Waves, Sound and Light” using one supplied case from each lesson. Include the observation, scientific mechanism or calculation, result and a limitation. You may draw and speak your explanation; all inputs are supplied.

Work on paper or in your own document. Explain the choices you made.

  • Use one supplied case from each of the four lessons.
  • Name the relevant structure, quantity or process in every panel.
  • Show calculations with units or a causal evidence chain.
  • Distinguish source facts from fictional classroom data.
  • State a model limit or a condition that would change the result.
Compare with a model response

Panel 1: A sound source and receiver lose all air and other material connection in an idealized gap. What is predicted? Which inference or prediction is best supported? Result: Ordinary sound cannot propagate across that material-free gap.. Reasoning: Sound is a mechanical disturbance needing a medium; source vibration and propagation are distinct. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified. Panel 2: Supplied case 1: complete cycles=30; duration (s)=3, using the explicitly named quantities. Frequency equals complete cycles divided by seconds. What result follows? Result: 10 Hz. Reasoning: Substitute the supplied values: (30)/(3) = 10 Hz. Count cycles, not half-cycle peaks separately. Frequency does not measure loudness. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified. Panel 3: A ray reaches a mirror and returns toward its original side. Which directional prediction follows? Which inference or prediction is best supported? Result: The returned component stays on the incident side by reflection.. Reasoning: Reflection redirects a component at the boundary; energy accounting remains separate. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified. Panel 4: A paper signal has twelve oscillations in three seconds. What does this input measure? Which inference or prediction is best supported? Result: Frequency is 12/3=4 oscillations per second.. Reasoning: Frequency counts repetitions per time; wavelength, amplitude and code meaning need other inputs. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified.

A different response can also meet the criteria. Compare the evidence and reasoning, rather than copying the wording.