Which is not a property of an electromagnetic wave?
O It is made of magnetic fields
It travels at the speed of light
O It is made of electrical fields
It carries energy only through matter

When you drop a pebble from height a it reaches the ground with speed v if there is no air resistance. from what height should you drop it so it will reach the ground with three times the speed? (a) 9m (b) 3m (c) 6m (d) 18m

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation

Language is not the only way that humans communicate. describe how we use sound, touch, chemicals, and sight to communicate. need answer asap