I would like you to have a look at the following Youtube videos that can be useful for you:
I would also suggest you to have a look at the light absorption spectrum of CuSO4 and compare it to the light absorption spectrum of plant pigments.
Maybe you can also read this article:
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Interested in expanding open inquiry opportunities in the classroom?
We are looking for new teachers for our Spring 2020 Session.
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This material is based upon work supported by the National Science Foundation under Grant No. 1502892.
Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
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