Select the correct answer. which scientist performed the cathode ray experiment leading to the discovery of electrons? a. dalton b. rutherford c. democritus d. bohr e. thomson

After cloud droplets form, what must happen to them for precipitation to occur?

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg