Suppose you find a rock that contains 10 micrograms of radioactive potassium-40, which has a half-life of 1.25 billion years
By measuring the amount of its decay product (argon-40 ) present in the rock, you conclude that there must have been 80 micrograms of potassium-40 when the rock solidified. How old is the rock?
A) 3.75 billion years B) 2.5 billion years C) 5.0 billion years D) 1.25 billion years
A
You might also like to view...
When a nucleus emits a beta particle, its atomic number
A) increases by 1. B) decreases by 1. C) increases by 2. D) decreases by 2. E) none of the above
Electric field is dimensionally equivalent to which of the following?
a. N/C2 c. N×m2/C2 b. N×m/C d. N/C
In the process of evaporation
1) heavier atoms are most prone to leave the liquid, 2) there is a net gain in the number of atoms in the liquid, 3) energy is absorbed by the liquid, 4) all of these, 5) none of these, and the average rate of molecular motion for the atoms remaining in the liquid 6) increases. 7) decreases. 8) remains unchanged.
If the size of our solar system were scaled down to a radius of 1 kilometer, approximately how far away would the nearest stars be on this scale?
A) several hundred kilometers B) several million kilometers C) several thousand kilometers D) several billion kilometers