Number of results: 1,083
advanced functions HELP!!!
Radioactive decay is the process by which an unstable element transforms into different element, typically releasing energy as it does so. For 500g of a radioactive substance with a half-life of 5.2 hours, the amount remaining is given by the formula M(t)=500(0.5) ^ t/5.2 a) ...
Wednesday, December 10, 2008 at 8:55pm by james
Hello! I need help with some Science things. 1. Where is a good place to find a picture that describes radioactive decay, fussion and fission/ 4. Scientists use the amount of radioactive isotopes found in rocks and fossils to calculate their ages. This process is called_____ 5...
Thursday, January 15, 2009 at 12:40pm by Amy
I need a picture that describes radioactive decay, fussion and fision. Someone said that they would give me a link earlier but they didnt. Thank you! This website helps me out so much.
Thursday, January 15, 2009 at 5:05pm by Amy
Check these pictures. http://images.google.com/images?hl=en&ie=ISO-8859-1&q=radioactive+decay%2C+fussion+and+fision&btnG=Search+Images&gbv=2
Thursday, January 15, 2009 at 5:05pm by Ms. Sue
Do you mean isotopes that undergo radioactive decay? There are quite a few of these. Some are used as medical tracers, Tc-99 is one see the applications section of some radioisotopes are used in the oil industry as tracers. C-14 is used in radiodating materials. K-40 is used ...
Saturday, February 7, 2009 at 8:46am by DrRuss
yes, i do mean isotopes that undergo radioactive decay. However i do not really understand what this radioactive thing have to do with isotopes or unstable or stable.
Saturday, February 7, 2009 at 8:46am by Nabiha
Physics - solar power in space
Hi, this requires some basic knowledge of astrophysics. I missed last lecture that covered this, so though I'd prefer thorough solutions to these problems, I'd appreciate it even if you could tell me which formulas to use to solve each part of the problem. Thanks! NASA’s Mars ...
Wednesday, March 4, 2009 at 3:42am by Mark
if the rate for radioactive decay for a substance is r=-.0063 and time is being measured in days how do you find the half-life of the substance to the nearest hour?
Monday, March 30, 2009 at 1:16am by mike
Does this sound right? Describe your assigned method and how it is used to evaluate geologic time. My assigned method was Absolute Dating / Numerical Age. Absolute Dating / Numerical Age is the process that assigns a numerical age ( this tells how old a rock or fossil is);to a...
Tuesday, March 31, 2009 at 9:47am by A.W.
How is nuclear radiation produced? What are 3 types of radioactive decay and how do they work? Thanks!
Friday, April 24, 2009 at 1:29pm by Lauren
Can you please: 1. briefly explain the concept of radioactive decay and describe how it can be used to find the absolute age of rocks. 2. contrast relative age with absolute age and describe at least three methods of determining either. 3. compare advantages and disadvantages ...
Friday, May 8, 2009 at 3:11pm by xxx
The age of a rock can be estimated by measuring the amount of 40Ar trapped inside. The calculation is based on the fact that 40K decays to 40Ar by a first-order process. It also assumes that none of the 40Ar produced by the reaction has escaped from the rock since it was ...
Thursday, May 21, 2009 at 3:46pm by Matt
These are questions that you could easily answer on your own. Just do a compter search. You will get better answers that way, in most cases, and you will develop the ability to find answers on your own. Alpha and beta rays are particles and gamma rays are not; they are a form ...
Monday, November 23, 2009 at 4:36pm by drwls
31. Radioactive decay of material is determined using the formula N = Noe^-kt. Find the constant k for Plutonium-239 given that its half-life is 24,390 years. ==> I don't really get where to start here because the problem does not give you how much Plutonium-239 there is. I...
Thursday, December 10, 2009 at 7:20pm by Emily
How long will it take for 25% of the C-14 atoms in a sample of C-14 to decay? The half-life for the radioactive decay of C-14 is 5730 years. If a sample of C-14 initially contains 1.1 mmol of C-14 , how many millimoles will be left after 2275 years?
Sunday, February 28, 2010 at 2:17pm by Anonymous
They are man-made radioisotopes of heavy elements that are not part of the natural radioactive decay series that start with uranium or thorium. In other words, they only found on Earth if they were created in an accelerator, nuclear explosion, or nuclear reactor.
Tuesday, March 9, 2010 at 6:50am by drwls
The half-life for radioactive decay of 14C is 5730 years (it emits β-particles with energy of 0.16 MeV). An archaeological sample contained wood that had only 72% of the 14C found in living trees. What is its age?
Thursday, April 8, 2010 at 4:02pm by Zoa
Do you mean fluorescence of bright visible light when illuminated by invisible ultraviolet light? Fluorescence is a property of some chemical compounds, not just elements. Radium (an element) glows because of radioactive decay that is always taking place. So does tritium, an ...
Wednesday, May 12, 2010 at 8:38pm by drwls
radioactive decay 212 RN----Azx----4He 86 2
Tuesday, March 6, 2007 at 3:25pm by shonna
The purpose of e and ln. It turns out, in natural processes, which are continual in nature, have a form of expontential (ie log) growth to a base e (2.71828....). So it is a handy base. Humans leared to count to number bases which were whole numbers (based on 10, or 8, or 4, ...
Thursday, October 21, 2010 at 10:54am by bobpursley