Check the attached file for the solution for this problem.
A. Moving with constant non-zero speed
Answer:
option "c"
Explanation:
because in gases molecules are further apart and move very quickly
The frequency doesn't change. If the wavespeed increases, then the wavelength must also increase ... It's just the distance the wave travels during each complete wiggle.
Answer:
You pull on the oars. By the third law, the oars push back on your hands, but that’s irrelevant to the motion of the boat. The other end of each oar (the blade) pushes against the water. By the third law, the water pushes back on the oars, pushing the boat forward.