If one kilogram of hydrogen is converted to helium, how much energy will be generated?
a. 9 1016 J
b. 3 108 J
c. 6.3 1014 J
d. 2.2 106 J
e. 3.2 107 J
Question 2
According to Kepler's third law, a planet's orbital period ___________________ _ is equal to its average distance from the Sun ___________________ _.
Fill in the blank(s) with correct word