A glow stick is a plastic tube that contains two separate liquids. When the liquids are mixed, they glow. The diagrams show the process that causes a glow stick to emit light.
Based on the diagrams, what energy transformations occur when using a glow stick?
A.
Chemical energy cracks the inner tube, which starts a reaction that transforms thermal energy into light energy.
B.
Thermal energy cracks the inner tube, which starts a reaction that transforms potential energy into light energy.
C.
Mechanical energy cracks the inner tube, which starts a reaction that transforms chemical energy into light energy.
D.
Potential energy cracks the inner tube, which starts a reaction that transforms mechanical energy into light energy.
1 answer
The correct answer is:
C. Mechanical energy cracks the inner tube, which starts a reaction that transforms chemical energy into light energy.
When the glow stick is bent, mechanical energy is applied to crack the inner tube, allowing the two chemicals to mix. This chemical reaction then takes place, which converts the chemical energy into light energy, causing the glow effect.
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