Physics and light - question 1

label Science
account_circle Unassigned
schedule 1 Day
account_balance_wallet $5

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
Jun 23rd, 2017
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