Answer:
Well, the options are not given in the questions. But the correct option is:
"Gamma rays do not completely penetrate earth atmosphere."
Explanation:
Most of the gamma rays coming from the stars and sun can not penetrate the earth's atmosphere because atmosphere is as thick to the gamma rays as a 12 foot thick plate of aluminium. They rather absorb in the atmosphere and knock out electrons by reacting with the atoms and produce ions and electrons. These secondary ions and electrons then came to earth during rain fall. Due to this reason gamma ray telescope was not get funded for the study of black holes.
Answer:
during American War, George Washington was voted as a military chef. So USA and France decided to be allies (France lost 7years war so they wanted to revenge to Great Britain).
after revolution
In 1778, Bill of Rights was made after that, every Americans got liberty, New laws with president and their own country (USA).
When mass is doubled, KE is doubled.
When speed is doubled, KE becomes 4 times as great.
When both are doubled (last choice), KE is multiplied by 8 .
By previous elements found in other stars, accurate guesses and lots of studying
