The half-life of a Radioactive sample is 80 hrs. Initially, there are 6,000,0000 nuclei in the sample. How many nuclei will remain after 10 days?

Emagnitude of the electrical force acting between a +2.4 ×  10–8  c charge and a +1.8 ×  10–6  c charge that are separated by 0.008 m is    n, rounded to the tenths place.

Ihave this 50 question test the layer of earth's atmosphere where atoms and molecules escape into space is referred to as the a) exosphere b) ionosphere. c) mesosphere d) thermosphere

The unit of resistivity is the: ohm ohm-cm volt coulomb