A plane sound wave of frequency 85.5Hz and velocity 342ms is reflected from a vertical wall. At what distance from the wall does the wave have an antinode​

The purpose of a lab is to do your "expirements" the importance of the topic is so you can now what the story is about and the last one is because no one is me with my question ( what is 3 over 4 x - 9 = 27 maybe you can )

Ireally don’t know

The best answer i can think of is b

Shania is trying to determine the oldest geologic unit on this map and the reason to why is she unable to do so is that  the units are all the same age.. when there is the same age, there will be no oldest geologic unit and that i cannot be credible.