Aradioactive material has a count rate of 1600 counts per minute. it has a half life of 20 minutes. how long will it take to decay to a rate of 100 counts per minute?

Is pain reliever a prescription drug?

In which environment would primary succession occur? a forest with a few remaining trees after a recent wildfire an area of exposed rock after a glacier melts away beach that is exposed to the air at low tide an abandoned baseball field in a small town

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change