A simple radioactive element with half life of two minutes initially contains 60×10^6atoms. calculate the time it would take for the atom to reduced to 7.5×10^6atoms

Asample of a gaseous substance changes into a liquid

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Which graph represents motion with an object with positive velocity that is located at a position of 3 meters at a time of 0 seconds? a) a b) bb eliminate c) c d) d