The half-life of radioactive iodine-137 is 8.0 days. How many iodine nuclei are necessary to produce an activity of 1.0 Ci? (1 Ci = 3.70 1010 Bq)
A) 4.6 109 B) 7.6 1012 C) 2.9 109 D) 3.7 1010
Question 2
In a certain velocity selector consisting of perpendicular electric and magnetic fields, the charged particles move toward the east, and the magnetic field is directed to the north. What direction should the electric field point?
A) downward
B) toward the west
C) toward the south
D) toward the east
E) upward
Ernst Haeckel's Tree of Life (1879)
A Fischer-Tropsch processing plant is able to produce a variety of fuels from coal.
Atmospheric currents carried radioactive fallout across much of Northern Hemisphere
Summary of Life's Characteristic
Remaining health-adjusted life expectancy (years) at age 25
Flowering plant life cycle