Plz a radioisotope has a half-life of 5.50 min and an initial decay rate of 7200 bq. what will be the decay rate after 22 min? show all work and include units of measure.

a radioisotope has a half-life of 5.50 min and an initial decay rate of 7200 bq. what will be the decay rate after 22 min? show all work and include units of measure.

the mass of an isotope of oxygen is 17.99161 u. it has 8 protons, 8 electrons, and 10 neutrons. what is its mass defect? show all work.

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

During which interval are the persons represented by the graph not moving? a) 0 to 0.5 hrs b) 1.5 to 2 hrs c) 2 to 2.5 hrs d) 4.5 to 5 hrs

What are the starting materials for nuclear fission? two small nuclei two large nuclei a neutron and a large nucleus a neutron and a small nucleus