Sinusoidal Waves: Why Is Textbook Answer 1.5ym?

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1 reply · 2K views · last reply Mar 16, 2010

Nyasha

The question and attempt to solution is on the attached image. I don't understand why the answer in the textbook is 1.5ym mine is 1.8 ym

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kuruman

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If φ₁ = 30^o and φ₂ = 80^o, then φ₂ - φ₁ is not 30^o as you claim in your solution.