The chapter we are on is Radioactive Decay and the Nucleus. Here is the question:

There are 600 g of radioactive iodine-133. The half life of iodine-133 is 21 h.

a) How much of this radioactive substance would exist after 21 h. ?
b) After 42 h. ?
c) After 126 h. ?

P.S. If you could explain how to do this and maybe show me how to work this problem out, I would appreciate it!

- Confused

For example, 126 = (6)(21) so the amount left after 126 hours is [LaTeX Error: Can't write to directory].

Decay equation:

[LaTeX Error: Can't write to directory]

[LaTeX Error: Can't write to directory] is intial mass

[LaTeX Error: Can't write to directory] is change in time

[LaTeX Error: Can't write to directory] is the half-life time interval

[LaTeX Error: Can't write to directory] is the mass remaining.

All you gotta to do now is substitute.

__________________
"Dissent is the highest form of patriotism." - Thomas Jefferson.

"Give me control of a nation's money and I care not who makes her laws." -Mayer Amschel Rothschild

I study Mathematical Physics at the
University of Waterloo.

-DC

It's easier to read if you write it as follows

[LaTeX Error: Can't write to directory]

Whatever floats your boat.

__________________
"Dissent is the highest form of patriotism." - Thomas Jefferson.

"Give me control of a nation's money and I care not who makes her laws." -Mayer Amschel Rothschild

I study Mathematical Physics at the
University of Waterloo.

-DC

Usually water.

Hehe. .

__________________
"Dissent is the highest form of patriotism." - Thomas Jefferson.

"Give me control of a nation's money and I care not who makes her laws." -Mayer Amschel Rothschild

I study Mathematical Physics at the
University of Waterloo.

-DC

I only mentioned it because the way Latex comes out it looks funny. It took me a few seconds for my eyes to adjust to what the expression was. Writing it in terms of exponentiating 2 makes it easier on my eyes and if its easier on my eyes there's a good chance its easier on others eyes too