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Materials Required
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* 2 plastic transparent glasses,
* Mineral water ,
* Tap water,
* Black paper or cloth,
* Marker.
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Method
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- Fill one plastic cup with mineral water and the other with tap water and label them with marker accordingly.
- Place both the cups in direct sunlight and place the black paper or cloth behind the cups.
- Just note what you see on the sides of the cup and brim in each cup.
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What is Learnt
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Ultra-violet rays are more readily absorbed by mineral water which is seen as a blue fluorescent light. Tap water does not remit out this light.
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Conclusion
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The mineral water contains a blue fluorescence on its surface, which is not seen in the cup of tap water. The ultra-violet light is absorbed by the quinine in mineral water and is re-emitted as visible blue fluorescence light.
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Flash Cards