Which of the following statements from the article presents relevant evidence for the argument that solar power is the best potential source of energy ? A. ”solar farms of photovoltaic cells produce current directly through solid-state chemical reactions.”

B. “Power plants also release 2/3 of sulfur oxides.”

C. ”The price of contracts for solar energy has dropped more than 63 percent.”

D. “Additionally, they account for 40 percent of underground freshwater draws.”

d.) circle motion requires a force to give it a centripetal acceleration.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

it takes on an electronical energy