A Radioisotope has a half life of 3 hours. How much of 120 gram sample remains after 9 hours

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

Plz mark brainliest 30 points 1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s. 2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false