An alpha particle is emitted from a radioactive source with an energy of 5 MeV. How fast is it moving (in m/s)? (m = 4.002 603 u, 1 u = 1.66 10-27 kg.)
a. 2.4 107
b. 1.6 107
c. 3.7 107
d. 4.6 107
e. 2.1 107
Question 2
Because we know that the half-lives of many radioactive isotopes are millions of years, we can deduce that
a. the longer it exists the more radioactive nuclei Earth produces.
b. the sun is the source of all the radioactive nuclei on Earth.
c. there must have been many more radioactive nuclei on Earth when life began.
d. there must have been far fewer radioactive nuclei on Earth before life began.
e. the natural radioactivity of minerals on the Earth was created by the Earth's internal temperature.
The moray eel meets its energy and nutrient needs by being an effective predator.
Tracing the Source of a Water-Borne Disease
Free Energy Rules: The Second Law in Open Systems
Geothermal Energy schematic
The decay rate of a radioactive sample decreases from 175 kBq to 12.4 kBq in 18.3 s. What is ...
Energy flows from the environment into living organisms, then back to the environment