3.) multiply distance to increase speed
I believe it is A, if I am remembering correctly from my last semester class.
Sample:
As soon as the lightning is seen, sound travels in the air for several kilometers until it eventually reaches the observer.
Answer:
An investigation is made to determine the performance of simple thin airfoils in the slightly supersonic flow region with the aid of the nonlinear transonic theory first developed by von Kármán[1]. Expressions for the pressure coefficient across an oblique shock and a Prandtl-Meyer expansion are developed in terms of a transonic similarity parameter. Aerodynamic coefficients are calculated in similarity form for the flat plate and asymmetric wedge airfoils, and curves are plotted. Sample curves for a flat plate and a specific asymmetric wedge are plotted on the usual coordinate grid of Cl, Cd,andCmc/4versus angle of attack and Cl versus Mach Number to illustrate the apparent features of nonlinear flow.
Explanation:
12.5 = 100 * (1/2)^n
divide by 100:
0.125 = (0.5)^n
this is equivalent to:
, which equals 3.
(since 0.5 cubed = 0.125)