I’m pretty sure it’s c.... hope it helps and hope it’s right.
Ok, let me see if I can help
Sound is caused by vibrations. These can pass through a solid, liquid, and gas. But not through vacuum because there are no particles
Its called the Phase Transition. Im assuming your asking what is it called when matter transitions between solid liquid and gas.
Wave D has the same wavelength as wave A, but the amplitude is lower. The answer is Wave D.