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We have been studying mechanical waves, using the mathematical description of a wave, however, im not quite sure how to solve the following, so if anyone has any pointers or hints that would be great!

You are told that two points x=0 and x=0.0900m are within one wavelength of each other. If the wave is moving in the +x-direction, determine the wavelength. We are also given the Amp = 4mm and the period which = 0.04 s.

Also see attached pic.

I tried simply using the following (however obviously I get the wrong ans, which should be 0.14m)

solve for lambda given

3mm = 4 mm . (cos (2pi (0.09/lambda)-0))

but my answer comes out as lambda = 0.782m???

pleaz help...cheers

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# Solving Mechanical Waves

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