What do radio waves and microwaves have in common?
a) both are found next to visible light on the electromagnetic spectrum.
b) both are at the side of the spectrum with the lowest frequency.
c) both are at the side of the spectrum that has the shortest wavelength.
d) both are at the side of the spectrum that has the highest radiant energy.

B, both are at the side of the spectrum with the lowest frequeny

Explanation: I did the test. hope this helps, have a great day/afternoon/night!

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

0.11 m/s and 0.28 m/s should be correct