Which characteristic accounts for the fact that red lights are used in dark rooms and DO NOT expose negatives during developing?
small size
low energy
high energy
high velocity

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.

In a series circuit the __ is the same at every point

What happens when a rubber rod is rubbed with a piece of fur?