What is damped vibration ?

What is a damped vibration ?

Which quantity of vibration gradually decreases during damped vibration ?

The motion of copper plate is damped when it is allowed to oscillate between the two plates of a magnet. What is the cause of this damping?

Sound is produced by vibrations of _________ located in the ___________.

If a resistive force acts on a vibrating body, then its amplitude of vibration gradually________ [Fill in the blank]