I think D. None of the above
I think that it
0.0000004. since it is 10^-7 (note the negative), you would move thedecimal point 7 places to the left.
Amplitude is the pair of vertical buttons, so to speak. Compressions are the bunched up vertical lines with the purple arrows pointing left and right. Rarefactions are purple arrows pointing down. Wavelength is crest to crest purple buttons. Associated LH and RH pointing arrows.
The answer is electricity
