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Need help for question 39

Need help for question 39
asked 191k views
14 votes
Need help for question 39

Need help for question 39-example-1
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User LeoRochael
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1 Answer

7 votes
I think it is just 4m because L represents 2 wavelengths: so 8/2 = 4
answered
User Verybadbug
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8.6k points
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