Number of results: 24,002
What elements results if one of the neutrons is in a nitrogen neucleus is converted by radioactive decay into a proton? The atomic number goes from 7 to 8, while the atomic weight stays the same. An electron (beta-) is emitted from the nucleus. Actually, this process does not ...
Tuesday, June 28, 2005 at 3:20pm by Jarrad Schomaker
Hey, can somebody here help me with this stuff? 1) Why are radioisotopes with long half-lives not administered internally in medical procedures? 2) What % of C-14 would you expect a piece of 34000 year-old fossilized bone from a mastodon to have when compared to a similar ...
Tuesday, January 2, 2007 at 6:03pm by Roger
Geology (college level)
What is the process by which elements form? In the stars, fusion mainly. On Earth, radioactive decay. For further reading: http://www.longman.co.uk/tt_secsci/resources/scimon/hoyle/hoyle.htm BIG BANG NUCLEOSYNTHESIS WAS THE FIRST PROCESS OF ELEMENT FORMATION Can some help The ...
Friday, February 9, 2007 at 8:52pm by Brandon
A manufacturer has observed that a certain product tends to fail either very early in its life span or quite late. The engineers are interested in studying a particular product going into cellular phones. They know that the average life span of the product is 1,600 days. What ...
Wednesday, March 7, 2007 at 3:21pm by Jason L
Classify each of these statements as always true, sometimes true, or never true. __ST___13.In an equation, a substance is shown to be in the gaseous state by placing an upward-pointing arrow after its formula. ___ST___14. Atoms are destroyed in a chemical reaction. ___AT____15...
Tuesday, March 13, 2007 at 7:03pm by Dennis
geology / science
the age of granite can be determind using radiometric dating, explain the basis for the determination of a 238 U- Pb radiometric date of 1120 Ma for a granite. I have as the answer 238 U decays to Pb with an experimental law, that is the amount of U and Pb in granite are ...
Wednesday, April 18, 2007 at 10:16am by bex
Can someone give me an example of how to use this formula: 15.Obtain three half-life (T0.5) times from the graph. Average them.(T0.5)av. Or is there a web site i can go to that shows all steps to using pennies for radioactive decay experiment? .
Thursday, November 15, 2007 at 1:25pm by Will
Can someone give me an example of how to use this formula: Obtain three half-life (T0.5) times from the graph. Average them.(T0.5)av. Or is there a web site i can go to that shows all steps to using pennies for radioactive decay experiment? .
Sunday, November 18, 2007 at 2:45pm by Will
Chemistry please check
1. All of the naturally occurring radioactive decay series end when the radioactive elements have decayed to bismuth (Bi) hydrogen (H) lead (Pb) uranium (U) answer: Uranium (U) 2. This type of radiation can easily pass through a human. gamma ultra-violet beta alpha answer: ...
Friday, February 15, 2008 at 11:35pm by Mary
The nuclide 12 N 7 is unstable. What type of radioactive decay would be expected??? my guess is either gamma or beta. are either of those correct?
Tuesday, March 4, 2008 at 5:25pm by Jonathan
Explain how redioactive decay has always warmed the Earth from the inside and how nuclear fusion has always warmed the Earth from the outside.
Friday, April 25, 2008 at 11:35pm by Rob
The slow radioactive decay of elements like Uranium that are still present in the earths crust generates heat from within. The fusion of hydrogen into helium in the sun, through a series of steps that also involve carbon and oxygen transmutation, provides the energy that keeps...
Friday, April 25, 2008 at 11:35pm by drwls in Sloveina
what changes in atomic number and mass number occur in a positron emmision of radioactive decay?
Monday, June 2, 2008 at 8:12pm by jerson
how does radioactive decay provide heat energy within the earth
Saturday, July 19, 2008 at 3:06pm by kate
A simple Geiger counter is constructed out of a setup similar to what we just used in problem 5. A thin wire with a linear charge density _ is held in the center of a cylindrical tube, which is filled with an inert gas. When a high speed 2 particle coming from a radioactive ...
Tuesday, September 23, 2008 at 2:44pm by al
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
What they are calling the lifetime (2 microseconds) is actually about 1.28 half lives. There is no "end of life" number for a muon. Like all radioactivity, muons decay exponentially. I have some other objections to this problem. The "99.9% of the speed of light" number is too ...
Sunday, March 20, 2011 at 10:20pm by drwls
chemistry -- radioactive decay
suppose you have a 150 gram sample of radioactive decay god-191 which has a half- life of 3.4 hours. how many grams of gold will ramain after 10hrs ? after 24 hrs? answer : 10 hrs :10/3.4= 2.94 times 150*(1/2)^2.94 = 18.75 grams 24 hrs: 24/3.4 = 7.06 150*(1/2)^7.06= 1.12 right...
Tuesday, September 18, 2012 at 11:53pm by Maria
Help plzzz Besides the major types of radioactive decay, there are two others: positron emission and electron capture. • Compare and contrast positrons with electrons. • Explain how positron emission works and how it causes transmutations. • Explain how electron capture works ...
Friday, May 31, 2013 at 2:12pm by Help!!! Maddie
Science- Radioactive Dating
Which of the following statements about radioactive dating is true? a. Radioactive decay is the rate at which new atoms form. b. During radioactive decay, atoms break down, releasing particles or energy. c. The rate of decay of a radioactive element cannot be approximated. d. ...
Thursday, October 10, 2013 at 2:41pm by Anonymous