a.) Find the pressure difference on an airplane wing where air flows over the upper surface with a speed of 120 m/s and along the bottom surface with a speed of 95 m/s.

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.

wavelength divides in half and speed stays the same.

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000