If the average distance between Earth and the Sun were doubled, what changes would occur in the sun's gravitational pull on Earth and Earth's period of revolution?
Doubling the distance from the sun reduces gravitational pull and increases the orbital period.
Using Newton's model of gravity the force or pull
Where G is the gravitational constant, M is the mass of the Sun, m is the mass of the Earth and r is the distance between Sun and Earth.
So, doubling the distance reduces the force by a factor of 4.
Kepler's third law relates the semi-major axis distance
In the case of Earth in its current position
This would make the orbital period