Submerging a red blood cell in distilled water will result in

Distilled water is an illustration of a lower osmotic pressure than a particular fluid solution, meaning it has less solute in it compared to a red blood cell. The red blood cells would “want” to be in a normal contraction, which would allow water to leave and exit the red blood cell, meaning the red blood cell would stay normal and not shrink or stretch. In a hypotonic atmosphere, water would blast into the red blood cell in an attempt to reach the symmetry, which would cause the red blood cell to lengthen, and perhaps even burst.

Atransverse wave (lowest wave) and a the transverse  wave's wavelength .

Yes yes yes very good