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
The Scale of Life
Life of a Medical School Student
Basidiomycetes Life Cycle
Half Full or Half Empty
How many grams of NO are required to produce 145 g of N2 in the following reaction? 4NH3 + 6NO ...
Life cycle of Obelia, a hydrazoan that has alternating medusa (left) and polyp generations