How long will it take for sound impulse to travel to copper rod 25 kilometers long?

0.071 seconds
7.1 seconds
140 seconds
0.14 seconds

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 2,000 calorie based diet.