Alternating compressions and rarefactions produce a wave. One compression and one rarefaction is called a wavelength.
Compression happens when molecules are forced, or pressed, together. Rarefaction occurs when molecules are given extra space and allowed to expand.
Meters would be the best way to record the length
The final speed of the orange is 7.35 m/s
Explanation:
The motion of the orange is a free fall motion, since there is only the force of gravity acting on it. Therefore, it is a uniformly accelerated motion with constant acceleration
towards the ground. So we can use the following suvat equation:

where
v is the final velocity
u is the initial velocity
a is the acceleration
t is the time elapsed
For the orange in this problem, we have
u = 0 (it is dropped from rest)
is the acceleration
Substituting t = 0.75 s, we find the final velocity (and speed) of the orange:

Learn more about free fall:
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Depends on how strong you are. People can hit it anywhere between a few inches and 500 yards.