Which one of the following types of waves are used in a night vision apparatus?

The purpose of defibrillation is to stop the chaotic, disorganized contraction of the cardiac cells. Defibrillation is a technique used in emergency medicine to terminate ventricular fibrillation or pulseless ventricular tachycardia. It uses an electrical shock to reset the electrical state of the heart so that it may beat to a rhythm controlled by its own natural pacemaker cells.

A duty or task that needs to be fulfilled is a responsibility that needs to happen.

For example : a doctor has his own task or responsibility, a police, a lawyer, etc... all have their own responsibilities.  

If the barometer rises, it indicates that good or fair weather is coming and if the falling barometer reading indicates that bad or foul weather is coming. Usually bad weather approaches from the west direction.