The speed of the object because it is moving
The one vibrating faster if you think about when singing in order to hit high notes you must push air faster while when singing lower you slow down the speed o air being pushed its the same with high pitch Nd low pitch frequency higher equals faster and lower equals slower
I think the answer would be C. hope i helped good luck :)
Hi, I'll attach my photo with the answers. In order, it's 1, 3, 4, and 2.
<u><em>I hope this helps! Feel free to give me Brainliest if you feel this helped. Have a good day, and good luck with your assignment. :)</em></u>