Aradioactive substance used in nuclear weapons decays at the rate of 3.33.3% per year. calculate the half-life of the radioactive substance.

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.