Physics and light - question 1

Science
Tutor: None Selected Time limit: 1 Day

help me please- again, you know who you are 

Oct 31st, 2014

I am here. Thanks and good luck. I have done all these questions before.

Oct 31st, 2014

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Oct 31st, 2014
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Oct 31st, 2014
Dec 9th, 2016
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