Identifying the Purpose of a Reference Point What is the purpose of a reference point?
to provide a standard system of measurement
to establish a point from which to measure future distance, or it movement has occurred
to determine the speed of an object in miles per hour
to provide a standard from which to evaluate variables m an experiment

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

Which best describes why nh4+ can form an ionic bond with cl-?

The electromagnetic force acts between what