To understand the interplay of observations and models you must first be able to distinguish between things that we observe and things that we infer from models. Consider the following statements about the Sun. Classify each statement as an observation or as an inference based on the current, accepted model for the Sun.
a. Sun emits neutrinos
b. The photosphere emits mostly visible light
c. Convection zone cooler than radiation zone
d. Core temp 10M Kelvin
e. Corona is hotter than the photosphere
f. The composition of the photosphere is the same as that of the gas cloud that gave birth to our solar system
j. Photosphere made mostly out of H and He
h. Sun generates energy by fusing H-->He at its core

Assume that two of the electrons at the negative terminal have attached themselves to a nearby neutral atom. there is now a negative ion with a charge -2e at this terminal. what are the electric potential and electric potential energy of the negative ion relative to the electron? the electric potential and the electric potential energy are both twice as much. the electric potential is twice as much and the electric potential energy is the same. the electric potential is the same and the electric potential energy is twice as much. the electric potential and the electric potential energy are both the same. the electric potential is the same and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron. the electric potential is twice as much and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron.