The wave crest shown as point X will reach line A in 3 seconds. In how many seconds will the same wave crest reach line B?

Explanation

The time it takes for crest X to reach line A is three-fourths the wave’s period (the time it would take for crest X to reach the point of the next crest in the figure). Hence the wave’s period is 4 seconds. Line B is located one full wavelength plus three fourths of a second wavelength to the right of point X. Multiply that distance by the wave’s period:1(3/4)*4=7 seconds

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