Standard Science Primary 4 Energy

Jun Jie tested three sheets of material, X, Y, and Z, by placing them between a light source and a light sensor. The light sensor reading was 500 lux without any sheet. Based on the table, which sheet is most likely OPAQUE?

A Material Z (Reading: 0 lux)
B None of the above
C Material Y (Reading: 210 lux)
D Material X (Reading: 480 lux)
Show Worked Solution

Worked Solution

Step 1: Opaque materials block all light from passing through. Step [2-9]: A light sensor behind an opaque material should show a reading of 0 lux. Step [2-9]: Material Z shows 0 lux.

Correct answer: Material Z (Reading: 0 lux)

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