Which radiation has no electric charge associated with it?
a) gamma rays
b) beta rays
c) alpha rays
d) all of these
e) none of these

Beta rays . . . No.  These are streams of negatively charged electrons.

Alpha rays . . . No.  These are streams of pairs of positively charged protons, identical to nucleii of Helium atoms.

Gamma rays (A) . . . Yes.  These are electromagnetic waves, not composed of charged particles.

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.