Homework Statement
An unpolarized laser emits 1.00 W of continuous optical power.
It's beam is directed into three identical linear polarizers, each with a maximum transmission of 95.0%. The first polarizer has its transmission axis vertical, the second at 45.0 from the vertical, and the...
Ah, OK that makes sense now. Thank you. I'm guessing that since there are so few C14 atoms, its fair to make the assumption that the entire 75g sample is C12 when finding the number of C12 atoms?
I did this, and got the correct answer, but I am still somewhat confused as to why.
My thought was that the C14 is the radioactive isotope, I should be trying to determine how much C14 is currently still present. To find that I need to figure out how much has decayed into C12. So I know the...
The 10-13 was a typo. I'm still having issues with this problem. I tried it again doing this:
N0 = 75g * 1.3*10-12 * (6.022*1023)gram-mol / (14gram-mol) = 4,19 * 1012
T1/2 = ln|2| / \lambda, solving for \lambda gives \lambda = 3.833*10-12
R=\lambdaN0e-\lambdat solving for t.
Plugging...
Homework Statement
An old wooden tool, containing 75.0 grams of carbon, is found in an ancient tomb. The tool emits 500 electrons/minute from the beta decay of 146C. How old is the wood from which the tool was constructed? Given: The half-life of 146C is 5730 years, the ratio of 146C to 126C in...
For the problem the mass of a proton(1.007825u) and alpha particle(4.002603u) is given in atomic mass units(u=931.494MeV). I converted to joules before doing any calculations involving power.
(answered)Four Protons Are Fused Into Alpha Particle, Energy Released
Answered: I wasn't supposed to multiply by c2. Thank you ehild
I apologize in advance if I posted this in an incorrect format or in the wrong section. I read the rules and I believe this is the correct format/place...