wave length = wave speed divided by its frequency
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speed= frqquency*wavelength
Wavelength*Frequency = Velocity of the wave. or Wavelength/Period = Velocity of the wave.
draw a triangle and make 3 areas in the triangle. on the top is S or Speed. on the bottom left is F or Frequency. and on the bottom right is a bckwards/upside down Y for Wavelength. then S divided by For Y. and F times Y. will get you wavelength and what you need. draw what i just said.
Wavelength is halved.
You cannot because there is not sufficient information.