And the final one, shown below, is at t= 0.010 s. (c) The wave can be written as ( , )sin()myxtykxtω=+, where /vk=is the speed of propagation. From the problem statement, we see that 2 / 0.40 5 rad/sωππ==and2 /80/ 40 rad/cmkππ. This yields 22.0 10 cm/s 2.0 m/sv=×=(d) These graphs (as well as the discussion in the textbook) make it clear that the wave is
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