She observed a shining Sun and said mumma its too hot today, while we were walking back from school bus. I asked her, can you tell me the colour of sunlight. She said white or yellow... not sure.
My second question was very easy. I asked, what will happen if you keep ice cube in sunlight. She said I don't know but if you remove ice from refrigerator, it will melt.
Her answer motivated me do some experiment. First, we kept two ice cubes, one in sunlight and another in shade... she observed that the one in sunlight melts faster. It was obvious to her...
Next, we did an experiment to learn different colours have different heat absorbing capacity. We took four different colour papers and four same size ice cube. We put one ice cube on each paper and placed all the papers in sunlight.
Observation: The black paper ice cube melts fastest and white paper ice cube melts very slowly.
We both learnt that black colour is the best heat absorber as it absorb all colour rays. White colour reflects all colour rays and hence the poor heat absorber. All other colours only reflects the colour they appear and absorb all other colours. Like red colour reflects only red rays and absorb all other colour rays.
My second question was very easy. I asked, what will happen if you keep ice cube in sunlight. She said I don't know but if you remove ice from refrigerator, it will melt.
Her answer motivated me do some experiment. First, we kept two ice cubes, one in sunlight and another in shade... she observed that the one in sunlight melts faster. It was obvious to her...
Next, we did an experiment to learn different colours have different heat absorbing capacity. We took four different colour papers and four same size ice cube. We put one ice cube on each paper and placed all the papers in sunlight.
Observation: The black paper ice cube melts fastest and white paper ice cube melts very slowly.
We both learnt that black colour is the best heat absorber as it absorb all colour rays. White colour reflects all colour rays and hence the poor heat absorber. All other colours only reflects the colour they appear and absorb all other colours. Like red colour reflects only red rays and absorb all other colour rays.
You can also use the colourful ice cubes to do this experiment.
great :)
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ReplyDeleteAwesome... Learn by Fun (LBF Techniques)....
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