What creates the van allen belts

A Van Allen belt is a area of energetic charged particles, most of them come from the solar wind, that are captured by and held around a planet by that planet's magnetic field. Earth has two of these belts and sometimes others may be temporarily created.

Explanation: hope this helps

c)as speed changes, wavelength and frequency change.

everything changes!

0.19 m/s and 0.45 m/s