TSGK Clan Forum

Freelancer · Posted: Wed Mar 07, 2007 15:07 Post subject: What is HALF-LIFE?

I was surfin the net and the n i stubled on this little Thread in Wiki.
Half-Life Theory
What do you think ? O_O

Killa/PPV · Joined: 30 Sep 2006 Posts: 579 Country: Browser: Age: 35

...
I dont understand anything Very Happy

, Freelancer , Can you teach me ? plz Rolling Eyes

deluxe · Posted: Wed Mar 07, 2007 16:42 Post subject:

half life is called the time that it takes for a quantity of radioactive elements to desintegrate half of the number of its cores which were present at the date t=0.
for example, u have a certain quantitiy of radioactive elements. at the time t=0 u have n cores. at the time t= half life u will have n/2 cores.
thats why a graphic of the number of radioactive cores during time is always a descending exponential function.

u can calculate the half life of an element if u use the formule:
t1/2 = ln(2) / lambda
lambda is the half life sign Wink

i used this formule once as my in game name lol

btw i dont know if u translate "noyau" by "core"!
@killa: seems like u havent been in terminale S Razz

Ellrick · Joined: 02 Mar 2007 Posts: 9 Country:

The half life of carbon is how they put a date on archaeological stuff too I believe.

Xmeagol · Posted: Wed Mar 07, 2007 22:07 Post subject:

yeah i knew that

Blue Shitf Opposing Force, Aftermath, their all physics related, valve didnt pick a random name

sargE · Posted: Wed Mar 07, 2007 22:41 Post subject:

Freelancer · Posted: Thu Mar 08, 2007 13:49 Post subject:

underscore_n0rm · Posted: Thu Mar 08, 2007 19:38 Post subject:

I can't remember too much, but I did alot of this stuff in my Integrated Chemistry and Physics class. It's very interesting when you get the formulas down. (now if only I could remember them)

Phat Bacon · Posted: Thu Mar 22, 2007 22:54 Post subject:

did anyone notice that little symbol in the equation to the left of the table on the wikipedia site? the denominator in the fraction. it looks like the lambda symbol. too funky Shocked

Diet H2O_TSGK · Posted: Fri Mar 23, 2007 02:13 Post subject:

Shimmy_TSGK · Posted: Fri Mar 23, 2007 03:10 Post subject:

the lambda is the decay constant. or half life
half life in lay mans terms means the time it takes for half the material to change into another material or gotten rid off. we use that in the medical world. As in the time it takes the body to get rid of a certain drug. so paracetamol or panadol has a half life of 1 to 4 hours. it takes the body 1 to 4 hours to metabolize half the paracetamol taken up by the body.

DogSoldier · Posted: Fri Mar 23, 2007 06:20 Post subject:

Xmeagol · Posted: Sun Mar 25, 2007 19:26 Post subject:

suckface · TSGK Member Joined: 08 Feb 2007 Posts: 30 Country: Age: 38

Just to add one thing to what DogSoldier said, Carbon 14 is the isotope, and it's generated far above the Earth when cosmic rays hit Nitrogen. Neat stuff Very Happy

Zog Ecosse · Posted: Sun Apr 22, 2007 02:47 Post subject: Half Life

Half life is three score years and ten devided by two or if you like --- being married with kids, morguage........................ etc, Half life is on line gaming with good buddies..................

Zog