I believe the answer you are looking for is color :)
It would be B because they are just an explanation of what happens during a experiment
Answer:
The speed is 401.76m/s
Explanation:
To find the fundamental frequency we use
3rd.harmonic - 2nd.harmonic = 324Hz
And we know that
f=v/2L
So v=f2L
v= 324 x 2 x 0.62= 401.76m/s
cation
anion is negatively charged, so more electrons then protons,
cation is positively charged, so more protons thatn electrons
≈ 0.67