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In a medium, sinusoidal waves propagate with a wavelength of 0.30 m, a frequency of 25...

In a medium, sinusoidal waves propagate with a wavelength of 0.30 m, a frequency of 25 Hz, and an amplitude of 4 mm (assume it propagates to the right). At x = 0 m and t = 0 s, the deviation is y = 4 mm. Determine:
a. Speed ​​of propagation and wave period
b. The distance between two points with different phases π/ 2

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