Measure the length between two crests or two troughs.
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The speed of the wave increases, the frequency remains constant and the wavelength increases. The angle of the wave also changes.
wave length = wave speed divided by its frequency
There isn't enough information in this question. You can calculate the speed of the wave (distance divided by time), which is the frequency times the wavelength. But you still need one of them to find the other.
speed= frqquency*wavelength
Wavelength*Frequency = Velocity of the wave. or Wavelength/Period = Velocity of the wave.