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21D. A wave equation (in SI) is y = 0.12 sin(1.5t - 0.67x). (a) What is the amplitude? (b) What is the frequency? (c)

21D. A wave equation (in SI) is y = 0.12 sin(1.5t - 0.67x). (a) What is the amplitude? (b) What is the frequency? (c) What is the wavelength? (d) What is the displacement at x = 2.5 m when t = 6.5 s?

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