Question

Gas escapes from the surface of a planet because it aquires escape velocity. The escape velocity will depend on which of the following
1) Mass of planet
2) Mass of particle escaping
3) Temperature of the planet
4) Radius of the planet

Answer 1

both 1 AND 4 i.e mass of planet and radius of planet because the formula of escape velocity is √2GM/√R  where G is constant and M is the mass of planet and R is the radius of planet.