Choose for Two Light Goals
Check whether one material satisfies two stated requirements.
Supplied materials
- Use the supplied fictional observations or model. Paper and pencil are optional; spoken answers are welcome. No equipment or real experiment is needed.
Learn the idea
A design choice begins with the job you need the material to do. A cover for a pretend display must let some light through and hide a clear view of the picture behind it. “Let some light through” is different from “block all light.” A material can meet one requirement and fail another.
Use new fictional test results: cover J transmits light and gives a clear view; cover K transmits light and gives a blurred view; cover L blocks light. J meets the light requirement but not the hidden-picture requirement. K meets both. L hides the picture but also blocks the needed light. The decision follows the notes rather than a real product claim.
- Write the two requirements: transmit some light and blur the picture.
- Mark yes or no for each requirement beside J, K, and L.
- Find the row with two yes marks.
- Write a choice sentence using both pieces of evidence.
See the method in action
K has “yes” for transmitting light and “yes” for blurring the picture. J is yes/no, and L is no/yes. K is the only cover meeting both recorded requirements.
Check your reasoning
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See the answer and explanation
K
K lets light through while blurring the view. J preserves a clear view and L blocks the required light.
Take it further
Change the goal to “block all tested light.” L now fits best; K no longer meets that changed goal because it transmits some light.
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Check the subject sources
These LifeStarter passages, scenarios and exercises are authored for this Academy with AI assistance and review. External resources keep their publishers’ terms. A grade label suggests a starting level; it does not establish alignment with your school’s complete requirements.