Assume light of frequency ω is incident from vacuum onto a good conductor (assume normal incidence). Show that the reflection coefficient is approximately R ≈ 1 − 2 ω c d, where d is the skin depth of the good conductor.

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.

a=d/t

a="triangle"v/t

explanation:

a = acceleration

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.