Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[Q]: Wave amplitude and wavelength are two important measures of wave size.
[A]: Wave amplitude and wavelength are two important measures of what?


[Q]: Water plus other substances makes a(n) solution.
[A]: Water plus other substances makes what?


[Q]: Light retains its original color under water because frequency remains the same when light is refracted.
[A]:
Light retains its original color under water because what remains the same when light is refracted?