A vibration that produces a wave takes 0.5 seconds to complete. What is the frequency of the wave?
A) 0.25 Hz
B) 0.5 Hz
C) 2 Hz
D) 4 Hz

iron would move it is magnetic there is a mag field around the current in the wire

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.

k2s for potassium sulphide